Allied Telesis C613-16164-00 REV E manual VRF-lite usage guidelines

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VRF-lite usage guidelines

VRF-lite usage guidelines

The general guideline is that all current services remain available in the default global VRF domain only, unless the service is either explicitly VRF aware, or the service runs completely independently of VRF and therefore has no requirement to be VRF aware.

VRF-LITE SPECIFIC GUIDELINES

Utility services such as TFTP, SNMP, SSH server, telnet server, system log, file copy, DHCP relay, DHCP server, DHCP snooping, NTP server are not VRF aware and remain available in the global VRF domain only.

VRF-lite is supported for IPv4 unicast and broadcast traffic only. L2 and L3 multicast services, including IGMP snooping, IGMP querier, IGMP proxy, PIM remain available via the global VRF domain only.

IPv6 routing protocols are not VRF aware and remain available in the global VRF domain only.

SNMP and syslog services remain available via the global VRF domain only.

In the case of Nested VLANs (VLAN double tagging), all VLANs (and associated switch ports) must be a member of the global VRF domain only.

GVRP is not supported in conjunction with VRF-lite.

QoS services remain available via the global VRF domain only.

Subnet-based VLAN classification is not supported in conjunction with VRF-lite.

All private VLANs must be a member of the global VRF domain only.

802.1Q trunked links are able to span multiple VRF instances with the x610 product only.

802.1Q trunked links are not able to span multiple VRF instances with x900 series switch and the Switchblade x908 switch - all VLANs associated with an 802.1Q trunked link must exist within a single VRF instance for these products.

All data VLANs and associated control VLAN associated with an EPSR domain must exist within the same VRF instance. For example, EPSR data VLAN(s) cannot reside in a different VRF instance than the associated control VLAN for an EPSR domain.

Both RSTP or MSTP can be used in conjunction with VRF. VLANs associated with an MSTP instance should exist within same VRF instance.

802.1x authentication services remain available via the global VRF domain only.

VRRP instances continue to operate on a per port basis - VRRP monitored interfaces defined in a VRRP instance should exist within the same VRF instance as the VRRP instance.

Filtering services (routemaps, access groups, ACLs) continue to work independently of VRF-lite.

Static aggregation and LACP continue to work independently of VRF-lite.

LLDP continues to work independently of VRF-lite.

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Contents What is VRF-lite? How To Configure VRF-lite IntroductionWhich products and software version does it apply to? Software feature licensesCommand summary Who should read this document?Contents VRF GlossaryUnderstanding VRF-lite Vlan5 VRF-lite security domainsRoute table and interface management with VRF-lite Interface management with VRFAdding a VRF-aware static ARP Route management with VRFInter-VRF communication Static and dynamic inter-VRF routing For example VRF-lite features in AW+ Ping VRF aware services includeRoute limiting per VRF instance VRF-aware utilities within AW+ Telnet client  SSH client TCP dump Awplusconfig# access-list standard Configuring VRF-liteAwplusconfig-if#switchportaccess vlanx Family Awplusconfig-route-map#match ip Ip route 192.168.50.0/24 Ip route vrf green 192.168.1.0/24 Static inter-VRF routingForwarding Information Base FIB and routing protocols Dynamic inter-VRF communication explainedBGP Inter-VRF communication via BGP Can be replaced with Using the route-target commandRoute-target import ASNVRFinstance For example Route-target both ASNVRFinstance For exampleVia BGP IVR, VRF shared will end up with the routes Also, if VRF shared configuration includesIf VRF red initially includes If VRF shared initially includesThen via BGP IVR, VRF red will end up with the routes If VRF shared configuration includesViewing source VRF and attribute information for a prefix How VRF-lite security is maintainedMultiple VRFs without inter-VRF communication Simple VRF-lite configuration examples26 Configure VRF-lite Vlan 28 Configure VRF-lite Configure VRF-lite 30 Configure VRF-lite Configure VRF-lite 32 Configure VRF-lite Inter-VRF configuration examples with Internet access Configuration Configure VRF-lite Example B Configuration 38 Configure VRF-lite Configure VRF-lite Example C Configuration 42 Configure VRF-lite Configure VRF-lite Configuring a complex inter-VRF solution Network description Each VLANs is associated with a VRF instance VRF communication plan Configuration breakdown Configure VRF-lite Configure Vrfs Configure the hardware ACLs This example, three access groups are attached to port Within the same IP subnet that the switch port is a member192.168.43.0/24 via the shared VRF Configure Vlan Database Configure IP Addresses Configure VRF-lite Configure Dynamic Routing Configure VRF-lite 56 Configure VRF-lite Configure Static Routing Complete show run output from VRF device is below Configure VRF-lite 60 Configure VRF-lite Configure VRF-lite IP route table from VRF device is below VRF blue Hostname Internetrouter Hostname sharedrouter N1 Ospf Nssa Hostname redospfpeerHostname greeniBGPpeer Hostname bluerippeer Hostname orangerouter Hostname orangeospfpeer Grey Other features used in this configurationVCStack and VRF-lite Stack provisioningVirtual Chassis ID X610 VCStack configurationX900 configuration 74 Configure VRF-lite Port Sharing VRF routing and double tagging on the same portCommunication plan GreenConfigurations X610 aX610 B Configure VRF-lite Additional notes BGP configuration tips 80 Configure VRF-lite VRF device Red router vlan database Red router Route Limits Configuring static route limitsConfiguring Dynamic route limits Allowed number of fib routes excluding Connect and Static100 Syntax No max-fib-routesVRF-lite usage guidelines Useful VRF-related diagnostics command list GeneralRouting general Routing protocols IP prefix network, e.g TCPdump HW platform table commands

C613-16164-00 REV E specifications

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