Allied Telesis 86251-08 manual Adopting the Vrrp IP Address

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SHOW IP ADVERTISE

Patch Release Note

Adopting the VRRP IP Address

Benefits The VRRP master router can adopt the IP address of the virtual router (VR), and respond to the following packets destined for the VR IP address, even if it does not own this IP address on any of its interfaces:

■ICMP echo requests (pings)

■Telnet and SSH connection requests

■HTTP and SSL GUI management requests

■SNMP requests, and

■DNS relay requests

VRRP IP Address Adoption allows continuous accessibility of the VR IP address even as the VR master changes. Using this feature:

■You can easily tell whether the VR is functioning, by pinging the single VR IP address.

■You can easily monitor the performance of the VR, regardless of which participating router is acting as master.

■DNS relay can continue functioning via the same IP address at all times.

Risks When VR IP Address Adoption is used, the master router accepts packets destined for the virtual router, even though it may not own this IP address. This does not conform to RFC 2338. Because the same IP address refers to different devices at different times, there is a risk of confusion arising. This risk can be reduced by a suitable network management policy.

Recommendations Before using VR IP address adoption, consider the following guidelines to avoid confusion:

■Ensure that the VR has an IP address that is different from the interface IP addresses of any of the individual routers in the VR.

■Ensure that all routers in the virtual router use VRRP IP Address Adoption (or that none do).

■Use the VR IP address to monitor the VR master. Be aware that this does not give information about one particular participating router, but about the current VR master, whichever participating router is acting as the master at the time.

■When changing the configuration of the participating routers using Telnet, GUI or SNMP, configure each device individually by pointing to their individual IP addresses.

■When changing the configuration of the participating routers, do not use the VR IP address. Only one device, the VR master, is responding to this IP address, and you may not know which device it is.

Configuration To configure VR IP Address Adoption, use the new parameter, ADOPTVRIP, that has been added to the CREATE VRRP and SET VRRP commands:

CREATE VRRP=vr-identifier OVER=physical-interface IPADDRESS=ipadd [ADOPTVRIP={ONOFF}] [other-vrrp- parameters]

SET VRRP=vr-identifier[ADOPTVRIP={ONOFF}] [other-vrrp-

parameters]

Patch 86251-08 for Software Release 2.5.1 C613-10356-00 REV I

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Contents Patch For Rapier Series Switches IntroductionFeatures PCR Module IPG LevelPCR 03359 Module Core Level PCR Module BGP LevelPCR 03684 Module Core Level PCR Module TTY, User LevelPCR Module STP Level PCR Module FIRE, Utility LevelPCR Module Isakmp Level PCR Module Ipsec LevelPCR Module SW56 Level PCR Module Firewall LevelPCR Module SWI Level PCR Module IGP LevelPCR 31001 Module Dhcp Level PCR Module Utility LevelPCR Module BGP Level PCR 31081 Module VRRP, IP, TCP, Telnet PCR Module File LevelPCR Module FFS Level PCR 31098 Module Dhcp LevelPCR 31106 Module MLD Level PCR Module IPX2 LevelPCR 02414 Module IPV6, SWI, IPG, Vlan PCR Module IPGPCR 03751 Module Mlds Level PCR Module OSPF, IPG LevelPCR Module ETH, IPG, IPv6, IPX Level PCR Module FILE, INSTALL, SCR Level PCR Module Install LevelPCR Module ETH Level PCR 03801 Module Mlds LevelPCR 03823 Module Vlan Level PCR 03843 Module Dhcp LevelPCR Module IPG, IPV6 Level PCR 03870 Module SWI, Vlan LevelPCR Module DHCP, Telnet Level PCR Module TTY LevelPCR Module Ikmp Level PCR Module Switch LevelPCR Module IP ARP Level PCR Module Firewall Network affecting No PCR Module Ospf Network affecting No PCR Module L2TP LevelPCR 03515 Module Dhcp Level PCR Module PRI LevelPCR Module PPP Level PCR 03547 Module Dhcp Level PCR Module BGP, TCP LevelPCR Module HTTP, Firewall Level PCR Module Http Level PCR Module Ping Level PCR Module FIREWALL, IPG LevelPCR 03584 Module MLD Level PCR Module STP, SWI Level PCR 03615 Module Load LevelPCR 03618 Module Dhcp Level PCR 03647 Module Snmp Level PCR Module PKI Level PCR 03691 Module Dvmrp LevelPCR 03698 Module Dvmrp Level PCR 03708 Module Dhcp LevelPCR Module PPP, VJC Level PCR Module IP LevelPCR Module Vrrp Level PCR Module Rsvp LevelFeatures PCR Module SSL Level PCR 03371 Module Dhcp LevelPCR Module IPSEC, Ikmp Level PCR 03405 Module Stream Level PCR 03410 Module VLAN, Core LevelPCR 03424 Module Dhcp Level PCR 03429 Module SWI, Vlan LevelPCR 03436 Module IP, Dhcp Level PCR Module IPX LevelPCR 03443 Module Dhcp Level PCR Module FR LevelPCR 03465 Module Dhcp Level PCR 03492 Module HTTP, Load Level PCR Module BGP, Firewall LevelPCR 03515 Module Dhcp Level PCR 02577 Module IPG, LOG Level PCR Module GUI LevelPCR 03089 Module Core Level PCR 03094 Module STP, Vlan LevelPCR 03096 Module Vlan Level PCR Module PIM, DVMRP, IPG LevelPCR 03109 Module LOG Level PCR Module Classifier LevelPCR Module ETH, IPG Level PCR Module IPG, SWI LevelPCR Module Cure Level PCR Module Port LevelPCR 03167 Module Dvmrp Level PCR 03153 Module ACC LevelPCR Module PCI Level PCR Module CORE, FFS, TTY Level PCR Module FIREWALL, LB LevelPCR Module LB Level PCR Module User LevelPCR 03205 Module Dhcp Level PCR 03229 Module Load LevelPCR 03247 Module MVR Level PCR 03239 Module QOS LevelPCR Module SWI, IPG, PIM Level PCR 03256 Module MLD Level PCR Module VLAN, IPG LevelPCR Module DHCP, Q931, Telnet Level PCR 03334 Module MVR Level PCR 03336 Module Core LevelPCR 03346 Module Snmp Level PCR Module IP, SWI LevelPCR 03370 Module MVR Level VlanPCR 03388 Module Dhcp Level ADD PPP Create PPP Delete PPP SET PPP Show PPP PCR 03067 Module Dhcp Level PCR 03068 Module SWI, QOS LevelPCR 03077 Module Core Level PCR Module IPV6 Network affecting NoPCR Module SWI Network affecting No PCR Module IPG Network affecting NoPCR Module PCI Network affecting No PCR Module IPG, ETH Network affecting NoAvailability Icmp Router Discovery Advertisements PCR Module TELNET, PING, IPV6, Network affecting NoPCR Module TCP Network affecting No PCR Module TM Network affecting NoRouter Advertisement Messages To change these settings, use one of the commands ADD IP Interface SET IP Interface ADD IP Advertise Interface Enable IP AdvertiseDisable IP Advertise Delete IP Advertise Interface SET IP Advertise Interface Example output from the Show IP Advertise command Show IP AdvertiseSame subnet Adopting the Vrrp IP Address MLD Snooping Ping Polling of Device Reachability Down device unreachable Enable and Disable Icmp Messages Icmp RedirectCommands Disable IP IcmpreplyStatic Igmp Show IP IcmpreplyConfiguration Example Commands Show IP IgmpSee Also Show IP Igmp Debug ADD IP Igmp Destination Create IP Igmp Destination Delete IP Igmp Destination Destroy IP Igmp DestinationDisable IP Igmp Debug Enable IP Igmp DebugChecking the Port Map on Rapier16fi Switches Show IP Igmp DebugHow to check that the port map is correct How to restore the correct port map PPPoE Client on Vlan Interfaces Force Eprom download Y ?ADD PPP Create PPP Delete PPP SET PPPVLANn-servicename, TNL- callname Show PPPShow PPP
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