Brocade Communications Systems ICX 6650 GRE MTU configuration considerations

Brocade ICX 6650 Layer 3 Routing Configuration Guide 99

53-1002603-01

IPv4 point-to-point GRE tunnels

NOTE

The above features are supported on VLANs that do not have VE ports.

•Whenever multiple IP addresses are configured on a tunnel source, the primary address of the

tunnel is always used for forming the tunnel connections. Therefore, carefully check the

configurations when configuring the tunnel destination.

•When a GRE tunnel is configured, you cannot configure the same routing protocol on the

tunnel through which you learn the route to the tunnel destination. For example, if the FastIron

learns the tunnel destination route through the OSPF protocol, you cannot configure the OSPF

protocol on the same tunnel and vice-versa. When a tunnel has OSPF configured, the FastIron

cannot learn the tunnel destination route through OSPF. This could cause the system to

become unstable.

•The tunnel destination cannot be resolved to the tunnel itself or any other local tunnel. This is

called recursive routing. This scenario would cause the tunnel interface to flap and the Syslog

message TUN-RECURSIVE-DOWN to be logged. To resolve this issue, create a static route for

the tunnel destination.

GRE MTU configuration considerations

The default Maximum Transmission Unit (MTU) value for packets in a GRE tunnel is 1476 bytes, or

10194 bytes for jumbo packets. The MTU of the GRE tunnel is compared with the outgoing packet

before the packet is encapsulated. After encapsulation, the packet size increases by 24 bytes.

Therefore, when changing the GRE tunnel MTU, set the MTU to at least 24 bytes less than the IP

MTU of the outgoing interface. If the MTU is not set to at least 24 bytes less than the IP MTU, the

size of the encapsulated packet will exceed the IP MTU of the outgoing interface. This will cause the

packet to either be sent to the CPU for fragmentation, or the packet will be dropped if the DF

(Do-Not-Fragment) bit is set in the original IP packet, and an ICMP message is sent.

Contents

Main Brocade Communications Systems, Incorporated Document History September 2012 Title Publication number Summary of changes Date Brocade ICX 6650 Layer 3 Routing Configuration Guide Contents About This Document Chapter 1 IP Configuration Page Chapter 2 Base Layer 3 and Routing Protocols Chapter 3 RIP (IPv4) Chapter 4 RIP (IPv6) Chapter 5 OSPF version 2 (IPv4) Chapter 6 OSPF version 3 (IPv6) Chapter 7 BGP (IPv4) Page Chapter 8 IPv6 Chapter 9 VRRP and VRRP-E Index Page About This Document Audience Supported hardware and software Brocade ICX 6650 slot and port numbering How this document is organized Document conventions Text formatting Command syntax conventions Notes, cautions, and warnings Notice to the reader Related publications Additional information Brocade resources Other industry resources Getting technical help Page IP Configuration TABLE 1 Feature Brocade ICX 6650 Basic IP configuration IP configuration overview Full Layer 3 support TABLE 1 IP interfaces Layer 3 Switches Page IP packet flow through a Layer 3 Switch FIGURE 1 ARP cache and static ARP table IP route table IP forwarding cache Layer 4 session table IP route exchange protocols IP multicast protocols IP interface redundancy protocols ACLs and IP access policies Basic IP parameters and defaults Layer 3 Switches When parameter changes take effect IP global parameters Layer 3 Switches TABLE 2 TABLE 2 TABLE 2 IP interface parameters Layer 3 Switches Table 3 lists the interface-level IP parameters for Layer 3 Switches. TABLE 3 TABLE 2 TABLE 3 Basic IP parameters and defaults Layer 2 Switches Basic IP parameters and defaults Layer 2 Switches IP global parameters Layer 2 Switches Table 4 lists the IP global parameters for Layer 2 Switches. TABLE 4 Basic IP parameters and defaults Layer 2 Switches TABLE 4 Interface IP parameters Layer 2 Switches Configuring IP parameters Layer 3 Switches Configuring IP addresses TABLE 5 Assigning an IP address to an Ethernet port Assigning an IP address to a loopback interface Assigning an IP address to a virtual interface Configuring IP Follow on a virtual routing interface Deleting an IP address Configuring 31-bit subnet masks on point-to-point networks Configuring an IPv4 address with a 31-bit subnet mask Configuration example FIGURE 2 ABC Displaying information for a 31-bit subnet mask Configuring DNS resolver FIGURE 3 Defining a domain name Defining DNS server addresses Defining a domain list Using a DNS name to initiate a trace route Configuring packet parameters - Changing the encapsulation type Changing the MTU Page Changing the router ID - - - Specifying a single source interface for specified packet types Telnet packets TACACS/TACACS+ packets RADIUS packets TFTP packets Syslog packets SNTP packets SSH packets SNMP packets ARP parameter configuration How ARP works Rate limiting ARP packets Changing the ARP aging period Enabling proxy ARP Enabling local proxy ARP Creating static ARP entries Changing the maximum number of entries the static ARP table can hold Configuring forwarding parameters Changing the TTL threshold Enabling forwarding of directed broadcasts Disabling forwarding of IP source-routed packets Enabling support for zero-based IP subnet broadcasts Disabling ICMP messages Disabling replies to broadcast ping requests Disabling ICMP destination unreachable messages Disabling ICMP redirect messages Static routes configuration Static route types Static IP route parameters Multiple static routes to the same destination provide load sharing and redundancy Static route states follow port states FIGURE 4 Configuring a static IP route Page Configuring a Null route Configuring load balancing and redundancy using multiple static routes to the same destination Configuring standard static IP routes and interface or null static routes to the same destination Page FIGURE 5 X FIGURE 6 Configuring a default network route Configuring IP load sharing How multiple equal-cost paths enter the IP route table How IP load sharing works TABLE 6 Response to path state changes Changing the maximum number of ECMP (load sharing) paths ICMP Router Discovery Protocol configuration IRDP parameters Enabling IRDP globally Enabling IRDP on an individual port Reverse Address Resolution Protocol configuration How RARP differs from BootP and DHCP Disabling RARP Creating static RARP entries Changing the maximum number of static RARP entries supported Configuring UDP broadcast and IP helper parameters Enabling forwarding for a UDP application Configuring an IP helper address BootP and DHCP relay parameter configuration BootP and DHCP relay parameters Configuring an IP helper address Configuring the BOOTP and DHCP reply source address Changing the IP address used for stamping BootP and DHCP requests Changing the maximum number of hops to a BootP relay server DHCP Server Configuration notes for configuring DHCP servers DHCP option 82 support DHCP Server options Page 70 Brocade ICX 6650 Layer 3 Routing Configuration Guide FIGURE 7 Configuring DHCP Server on a device Default DHCP Server settings DHCP Server CLI commands TABLE 7 TABLE 8 TABLE 9 TABLE 8 TABLE 9 Removing DHCP leases Enabling DHCP Server Disabling DHCP Server on the management port Setting the wait time for ARP-ping response Creating an address pool Enabling relay agent echo (Option 82) Configuring the IP address of the DHCP server Configuring the boot image Page Configuring the NetBIOS server for DHCP clients Configuring the subnet and mask of a DHCP address pool Configuring a next-bootstrap server Configuring the TFTP server Displaying DHCP Server information Displaying active lease entries Displaying address-pool information TABLE 10 Displaying lease-binding information in flash memory TABLE 11 Displaying summary DHCP server information DHCP Client-Based Auto-Configuration and flash image update TABLE 12 FIGURE 8 Configuration notes and feature limitations for DHCP Cient-Based Auto-Configuration How DHCP Client-Based Auto-Configuration and flash image update works Brocade ICX 6650 Layer 3 Routing Configuration Guide 83 FIGURE 9 IP Address Validation and Lease Negotiation Legend: Typical process (may change depending on environment) Existing Device New Device Other Possible Events TFTP Configuration Download and Update Page Supported options for DHCP Servers Configuration notes for DHCP servers Disabling or re-enabling Auto-Configuration Disabling or re-enabling Auto-Update Displaying DHCP configuration information The following example shows a Layer 2 device configuration as a result of the show run command. The following example shows a Layer 3 device configuration as a result of the show run command. DHCP Log messages The following DHCP notification messages are sent to the log file. Configuring IP parameters Layer 2 Switches Configuring the management IP address and specifying the default gateway Assigning an IP address to a Brocade Layer 2 switch Configuring Domain Name Server resolver Defining a DNS entry Using a DNS name to initiate a trace route FIGURE 10 Changing the TTL threshold [ DHCP Assist configuration FIGURE 11 How DHCP Assist works FIGURE 12 FIGURE 13 Configuring DHCP Assist IPv4 point-to-point GRE tunnels IPv4 GRE tunnel overview GRE packet structure and header format Path MTU Discovery (PMTUD) support Configuration considerations for PMTUD support Support for IPv4 multicast routing over GRE tunnels Strict RPF check for multicast protocols GRE support with other features Support for ECMP for routes through a GRE tunnel ACL, QoS, and PBR support for traffic through a GRE tunnel Syslog messages related to GRE IP tunnels Configuration considerations for GRE IP tunnels GRE MTU configuration considerations Configuration tasks for GRE tunnels TABLE 13 Creating a tunnel interface Configuring the source address or source interface for a tunnel interface Deleting an IP address from an interface configured as a tunnel source Configuring the destination address for a tunnel interface Enabling GRE encapsulation on a tunnel interface Applying an ACL or PBR to a tunnel interface Configuring an IP address for a tunnel interface Configuring a static route to a tunnel destination Changing the MTU value for a tunnel interface Changing the maximum number of tunnels supported Configuring GRE link keepalive Configuring Path MTU Discovery Enabling IPv4 multicast routing over a GRE tunnel IPv4 point-to-point GRE tunnels Point-to-point GRE tunnel configuration example Device A Device B FIGURE 16 The following shows the configuration commands for the example shown in Figure 16. Displaying GRE tunneling information TABLE 14 Displaying multicast protocols and GRE tunneling information Page Clearing GRE statistics Displaying IP configuration information and statistics Changing the network mask display to prefix format Displaying IP information Layer 3 Switches Displaying global IP configuration information Syntax: show ip TABLE 16 Global settings Static routes Displaying CPU utilization statistics Policies TABLE 16 Page Displaying IP interface information TABLE 17 Page TABLE 18 Page Displaying the forwarding cache TABLE 19 TABLE 20 Displaying the IP route table TABLE 20 Page Example Clearing IP routes TABLE 21 To clear route 10.157.22.0/24 from the IP routing table, enter the clear ip route command. Displaying IP traffic statistics To display IP traffic statistics, enter the show ip traffic command at any CLI level. The show ip traffic command displays the following information. TABLE 22 UDP statistics IP statistics ICMP statistics TCP statistics RIP statistics Displaying IP information Layer 2 Switches Displaying global IP configuration information TABLE 23 TABLE 22 Displaying IP traffic statistics TABLE 24 Syntax: show ip traffic The show ip traffic command displays the following information. TABLE 25 IP statistics ICMP statistics UDP statistics TCP statistics TABLE 25 Base Layer 3 and Routing Protocols Adding a static IP route TABLE 26 Adding a static ARP entry Modifying and displaying Layer 3 system parameter limits Layer 3 configuration notes Displaying Layer 3 system parameter limits Configuring RIP Enabling RIP Enabling redistribution of IP static routes into RIP Configuring a redistribution filter Enabling redistribution Enabling learning of default routes Changing the route loop prevention method Other Layer 3 protocols Enabling or disabling routing protocols Enabling or disabling Layer 2 switching Configuration notes and feature limitations for Layer 2 switching Command syntax for Layer 2 switching RIP (IPv4) RIP overview TABLE 27 RIP parameters and defaults RIP global parameters TABLE 28 RIP parameters and defaults RIP interface parameters TABLE 29 Parameter Description Default Reference TABLE 28 RIP parameter configuration Enabling RIP Enabling ECMP for routes in RIP Configuring metric parameters Changing the cost of routes learned on a port Configuring a RIP offset list - - Changing the administrative distance Configuring redistribution Configuring redistribution filters Page Changing the redistribution metric Enabling redistribution Removing a RIP redistribution deny filter Route learning and advertising parameters Changing the update interval for route advertisements Enabling learning of RIP default routes Configuring a RIP neighbor filter Denying route advertisements for connected routes Changing the route loop prevention method Disabling poison reverse Suppressing RIP route advertisement on a VRRP or VRRP-E backup interface Configuring RIP route filters Applying a RIP route filter to an interface Displaying RIP filters Displaying RIP filters To display the RIP filters configured on the router, enter the show ip rip command at any CLI level. Syntax: show ip rip Table 3 0 describes the information displayed by the show ip rip command. TABLE 30 Route filters Displaying CPU utilization statistics Page Page RIP (IPv6) RIPng overview TABLE 31 Summary of configuration tasks RIPng configuration Enabling RIPng RIPng timers Updating RIPng timers TABLE 32 Route learning and advertising parameters Configuring default route learning and advertising Advertising IPv6 address summaries Redistributing routes into RIPng Controlling distribution of routes through RIPng Configuring poison reverse parameters Clearing RIPng routes from the IPv6 route table Displaying the RIPng configuration Displaying the RIPng configuration To display RIPng configuration information, enter the show ipv6 rip command at any CLI level. Syntax: show ipv6 rip Table 3 3 describes the information displayed by the show ipv6 rip command. TABLE 33 Displaying RIPng routing table TABLE 34 Page OSPF version 2 (IPv4) TABLE 35 Feature Brocade ICX 6650 OSPF overview FIGURE 17 OSPF point-to-point links Designated routers in multi-access networks Designated router election in multi-access networks FIGURE 18 FIGURE 19 - - - X Reduction of equivalent AS External LSAs FIGURE 20 Algorithm for AS External LSA reduction - - Support for OSPF RFC 2328 Appendix E Dynamic OSPF activation and configuration Dynamic OSPF memory OSPF graceful restart Configuring OSPF OSPF configuration rules OSPF parameters Global parameters Interface parameters Enabling OSPF on the router Note regarding disabling OSPF Resetting OSPF Assigning OSPF areas - - Assigning a totally stubby area Assigning a Not-So-Stubby Area FIGURE 21 Assigning an area range (optional) Assigning interfaces to an area Modifying interface defaults OSPF interface parameters Page Changing the timer for OSPF authentication changes - - - Block flooding of outbound LSAs on specific OSPF interfaces Configuring an OSPF non-broadcast interface Assigning virtual links FIGURE 22 Modifying virtual link parameters Virtual link parameter descriptions Changing the reference bandwidth for the cost on OSPF interfaces Interface types to which the reference bandwidth does not apply Changing the reference bandwidth Defining redistribution filters FIGURE 23 Page Preventing specific OSPF routes from being installed in the IP route table Using a standard ACL as input to the distribution list Using an extended ACL as input to the distribution list Page Modifying the default metric for redistribution Enabling route redistribution Example using a route map Disabling or re-enabling load sharing FIGURE 24 Brocade Switch Configuring external route summarization Configuring default route origination Modifying SPF timers Modifying the redistribution metric type Administrative distance Configuring administrative distance based on route type Configuring OSPF group Link State Advertisement pacing Usage guidelines for configuring OSPF group LSA pacing Changing the LSA pacing interval Modifying OSPF traps generated Specifying the types of OSPF Syslog messages to log Modifying the OSPF standard compliance setting Modifying the exit overflow interval Configuring an OSPF point-to-point link Configuration notes and limitations for OSPF point-to-point link Configuration syntax for OSFP point-to-point link Viewing configured OSPF point-to-point links Clearing OSPF information Clearing OSPF neighbor information Clearing OSPF topology information Clearing redistributed routes from the OSPF routing table Clearing information for OSPF areas Displaying OSPF information Displaying general OSPF configuration information Syntax: show ip ospf config Displaying OSPF area information Displaying OSPF neighbor information TABLE 36 Page Displaying OSPF interface information To display OSPF interface information, enter the show ip ospf interface command at any CLI level. TABLE 38 Displaying OSPF route information Displaying the routes that have been redistributed into OSPF Displaying OSPF external link state information TABLE 40 Displaying OSPF link state information TABLE 40 Displaying the data in an LSA Displaying OSPF virtual neighbor information Displaying OSPF virtual link information Displaying OSPF ABR and ASBR information Displaying OSPF trap status Displaying OSPF graceful restart information Syntax: show ip ospf database grace-link-state Table 41 defines the fields in the show output. TABLE 41 OSPF version 3 (IPv6) OSPF (IPv6) overview TABLE 42 Differences between OSPF V2 and OSPF V3 Link state advertisement types for OSPF V3 OSPF V3 configuration Enabling OSPF V3 Assigning OSPF V3 areas Assigning a totally stubby area Assigning interfaces to an area Configuring virtual links Assigning a virtual link source address Modifying virtual link parameters Changing the reference bandwidth for the cost on OSPF V3 interfaces Redistributing routes into OSPF V3 Configuring route redistribution into OSPF V3 Modifying default metric for routes redistributed into OSPF V3 Modifying metric type for routes redistributed into OSPF V3 External route summarization Configuring external route summarization Filtering OSPF V3 routes Configuration examples for filtering OSPF V3 routes Configuring an OSPF V3 distribution list using an IPv6 prefix list as input Page Configuring an OSPF V3 distribution list using a route map as input Configuring an OSPF V3 distribution list using a route map that uses a prefix list Default route origination Configuring a default route origination Shortest path first timers Modifying shortest path first timers Administrative distance Configuring administrative distance based on route type Configuring the OSPF V3 LSA pacing interval Modifying exit overflow interval Modifying external link state database limit Modifying OSPF V3 interface defaults Disabling or re-enabling event logging IPsec for OSPF V3 IPsec for OSPF V3 configuration General considerations when configuring IPsec for OSPF V3 Interface and area IPsec considerations Considerations for IPsec on virtual links Specifying the key rollover timer Configuring IPsec on a interface Page Configuring IPsec for an area Configuring IPsec for a virtual link Disabling IPsec on an interface Changing the key rollover timer Clearing IPsec statistics Displaying OSPF V3 Information Displaying OSPF V3 area information TABLE 43 Displaying OSPF V3 database information Page Page The fields that display depend upon the LSA type as shown in the following table. TABLE 45 Router LSA (Type 1) (Rtr) fields Network LSA (Type 2) (Net) fields Inter-Area Prefix LSA (Type 3) (Inap) fields Inter-Area Router LSA (Type 4) (Inar) fields Link LSA (Type 8) (Link) fields TABLE 45 Displaying OSPF V3 interface information TABLE 45 Page Page Displaying OSPF V3 memory usage Syntax: show ipv6 ospf memory TABLE 47 Displaying OSPF V3 neighbor information TABLE 48 TABLE 49 TABLE 50 Displaying routes redistributed into OSPF V3 TABLE 50 Displaying OSPF V3 route information TABLE 51 These displays show the following information. Displaying OSPF V3 SPF information You can display the following OSPF V3 SPF information: TABLE 52 TABLE 53 TABLE 54 Displaying IPv6 OSPF virtual link information Displaying OSPF V3 virtual neighbor information TABLE 55 TABLE 56 IPsec examples Showing IPsec security association information Showing IPsec policy TABLE 57 Showing IPsec statistics TABLE 58 TABLE 57 Displaying IPsec configuration for an area TABLE 59 Displaying IPsec for an interface TABLE 59 TABLE 60 Page BGP (IPv4) TABLE 61 BGP4 overview FIGURE 25 Relationship between the BGP4 route table and the IP route table How BGP4 selects a path for a route BGP4 message types OPEN messages exchanged with BGP4 routers UPDATE messages from BGP4 routers KEEPALIVE messages from BGP4 routers NOTIFICATION messages from BGP4 routers BGP4 graceful restart Basic configuration and activation for BGP4 Note regarding disabling BGP4 BGP4 parameters BGP4 parameter changes Parameter changes that take effect immediately BGP4 parameter changes after resetting neighbor sessions BGP4 parameter changes after disabling and re-enabling redistribution Basic configuration tasks required for BGP4 Enabling BGP4 on the router Changing the router ID - - - Setting the local AS number Adding a loopback interface Adding BGP4 neighbors Page Page Page Page Encryption of BGP4 MD5 authentication keys Page Adding a BGP4 peer group Peer group parameters Peer group configuration rules Page Configuring a peer group Applying a peer group to a neighbor Administratively shutting down a session with a BGP4 neighbor Page Optional BGP4 configuration tasks Changing the Keep Alive Time and Hold Time Changing the BGP4 next-hop update timer Enabling fast external fallover Changing the maximum number of paths for BGP4 load sharing How load sharing affects route selection How load sharing works Changing the maximum number of shared BGP4 paths Customizing BGP4 load sharing Specifying a list of networks to advertise Specifying a route map name when configuring BGP4 network information Changing the default local preference Using the IP default route as a valid next hop for a BGP4 route Advertising the default route Changing the default MED (Metric) used for route redistribution Enabling next-hop recursion Example when recursive route lookups are disabled Example when recursive route lookups are enabled Enabling recursive next-hop lookups Changing administrative distances Page Requiring the first AS to be the neighbor AS Disabling or re-enabling comparison of the AS-Path length Enabling or disabling comparison of the router IDs Configuring the Layer 3 switch to always compare Multi-Exit Discriminators Treating missing MEDs as the worst MEDs Route reflection parameter configuration FIGURE 26 Route reflection based on RFC 2796 Configuration procedures for BGP4 route reflector Configuration notes for BGP4 autonomous systems FIGURE 27 Configuring a BGP confederation Page Aggregating routes advertised to BGP4 neighbors Configuring BGP4 graceful restart Configuring timers for BGP4 graceful restart (optional) Configuring the restart timer for BGP4 graceful restart Configuring the BGP4 graceful restart stale routes timer BGP null0 routing FIGURE 28 Configuration steps for BGP null0 routing Configuration examples for BGP null0 routing Show commands for BGP null0 routing BGP null0 routing Modifying redistribution parameters Redistributing connected routes Redistributing RIP routes Redistributing OSPF external routes Redistributing static routes Disabling or re-enabling re-advertisement of all learned BGP4 routes to all BGP4 neighbors Redistributing IBGP routes into RIP and OSPF Filtering Specific IP address filtering AS-path filtering Defining an AS-path filter Defining an AS-path ACL Using regular expressions to filter TABLE 62 Filtering TABLE 62 Character Operation BGP4 filtering communities Defining a community filter Defining a community ACL Defining IP prefix lists Defining neighbor distribute lists Defining route maps Entering the route map into the software Specifying the match conditions Match examples using ACLs Page Setting parameters in the routes Page Using a table map to set the tag value Configuring cooperative BGP4 route filtering Enabling cooperative filtering Sending and receiving ORFs Displaying cooperative filtering information Route flap dampening configuration Globally configuring route flap dampening Using a route map to configure route flap dampening for specific routes Using a route map to configure route flap dampening for a specific neighbor Removing route dampening from a route Removing route dampening from neighbor routes suppressed due to aggregation Page Displaying and clearing route flap dampening statistics Displaying route flap dampening statistics Clearing route flap dampening statistics Generating traps for BGP TABLE 63 Displaying BGP4 information Displaying summary BGP4 information Table 6 4 lists the field definitions for the command output. TABLE 64 Page Displaying the active BGP4 configuration TABLE 64 Page Displaying summary neighbor information TABLE 65 Displaying BGP4 neighbor information Page Page Page Page Page Displaying route information for a neighbor Table 6 7 lists the field definitions for the command output. TABLE 67 Displaying peer group information Displaying summary route information Syntax: show ip bgp routes summary Table 6 8 lists the field definitions for the command output. TABLE 68 Displaying the BGP4 route table TABLE 68 Displaying the best BGP4 routes Displaying the best BGP4 routes that are not in the IP route table Displaying BGP4 routes whose destinations are unreachable Displaying information for a specific route These displays show the following information. TABLE 69 Displaying route details TABLE 69 Page Displaying BGP4 route-attribute entries TABLE 70 Table 71 lists the field definitions for the command output. Displaying the routes BGP4 has placed in the IP route table TABLE 71 Displaying route flap dampening statistics Displaying the active route map configuration TABLE 72 Displaying BGP4 graceful restart neighbor information Updating route information and resetting a neighbor session Using soft reconfiguration Enabling soft reconfiguration Placing a policy change into effect Displaying the filtered routes received from the neighbor or peer group Displaying all the routes received from the neighbor Dynamically requesting a route refresh from a BGP4 neighbor Dynamically refreshing routes - - - Displaying dynamic refresh information Closing or resetting a neighbor session Clearing and resetting BGP4 routes in the IP route table Clearing traffic counters Clearing route flap dampening statistics Removing route flap dampening Clearing diagnostic buffers Page IPv6 Static IPv6 route configuration Configuring a static IPv6 route TABLE 73 TABLE 74 IPv6 over IPv4 tunnels FIGURE 29 IPv6 over IPv4 tunnel configuration notes Configuring a manual IPv6 tunnel Clearing IPv6 tunnel statistics Displaying IPv6 tunnel information Displaying a summary of tunnel information Displaying tunnel interface information TABLE 75 Displaying interface level IPv6 settings TABLE 76 IPv6 over IPv4 tunnels ECMP load sharing for IPv6 Disabling or re-enabling ECMP load sharing for IPv6 Changing the maximum load sharing paths for IPv6 Enabling support for network-based ECMP load sharing for IPv6 Displaying ECMP load-sharing information for IPv6 Page VRRP and VRRP-E TABLE 78 VRRP and VRRP-E overview VRRP overview FIGURE 30 FIGURE 31 Virtual router ID Virtual router MAC address Virtual router IP address Master negotiation Hello messages Master and Owner backup routers Track ports and track priority Suppression of RIP advertisements for backed-up interfaces Authentication Independent operation of VRRP alongside RIP, OSPF, and BGP4 Dynamic VRRP configuration VRRP-E overview Page FIGURE 32 ARP behavior with VRRP-E Comparison of VRRP and VRRP-E VRRP VRRP-E Architectural differences between VRRP and VRRP-E Management protocol Virtual router IP address (the address you are backing up) Master and Backup routers VRRP and VRRP-E parameters TABLE 79 Page Page Note regarding disabling VRRP or VRRP-E Basic VRRP parameter configuration Configuration rules for VRRP Configuring the Owner for IPv4 VRRP Configuring the Owner for IPv6 VRRP Configuring a Backup for IPv4 VRRP Configuring a Backup for IPv6 VRRP Configuration considerations for IPv6 VRRP v3 and IPv6 VRRP-E v3 support on Brocade devices Basic VRRP-E parameter configuration Configuration rules for VRRP-E Configuring IPv4 VRRP-E Configuring IPv6 VRRP-E Additional VRRP and VRRP-E parameter configuration VRRP and VRRP-E authentication types Configuring authentication type Syslog messages for VRRP-E HMAC-MD5-96 authentication VRRP router type Configuring Router 1 as VRRP VRID Owner Configuring Router 2 as VRRP Backup Configuring an IPv6 VRRP v3 interface as a Backup for a VRID Configuring an IPv6 VRRP-E v3 interface as a Backup for a VRID Suppression of RIP advertisements Suppressing RIP advertisements for the backed-up interface in Router 2 Hello interval configuration Dead interval configuration Backup Hello message state and interval Track port configuration Track priority configuration Backup preempt configuration Changing the timer scale TABLE 80 VRRP-E slow start timer TABLE 80 VRRP-E Extension for Server Virtualization Short-path forwarding configuration notes Brocade ICX 6650 Layer 3 Routing Configuration Guide 443 Additional VRRP and VRRP-E parameter configuration FIGURE 33 VRRP-E Extension for short-path forwarding example Displaying short-path forwarding combinations Forcing a Master router to abdicate to a Backup router Displaying VRRP and VRRP-E information Displaying summary information TABLE 81 Displaying detailed information TABLE 81 Page TABLE 82 Interface parameters VRID parameters TABLE 82 Displaying detailed information for an individual VRID TABLE 82 TABLE 83 Displaying statistics TABLE 83 TABLE 84 Interface statistics VRID statistics Clearing VRRP or VRRP-E statistics Page Displaying VRRP and VRRP-E information for IPv6 Displaying detailed information for IPv6 VRRP v3 and IPv6 VRRP-E v3 Page Configuration examples VRRP example Configuring Switch 1 Configuring Switch 2 VRRP-E example Configuring Switch 1 Configuring Switch 2 Page Page Index Numerics A B C Page Page D E F G I Page L M N O Page P R S T U V Z