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S/N-Series VRRP Backup Router does not perform Proxy ARP

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TitleS/N-Series VRRP Backup Router does not perform Proxy ARP
Symptoms
  • S/N-Series VRRP Backup Router does not perform Proxy ARP
  • The VRRP backup router will not engage in proxy ARP behavior.
  • x.x.x.x/32 loopback management (and other IP) fails if the router is acting as VRRP backup.
  • When VRRP is in backup mode, the interface will not proxy as expected for a /32 loopback address (such as is created during DFE 6.x to 7.x upgrade).
  • If the interface state changes to VRRP master; management access to the loopback works as expected, and proxy ARP from the matching VLAN interface functions as expected.
Environment
  • S-Series, all firmware
  • Matrix N-Series DFE, all firmware
Cause
By design, the VRRP backup router will not proxy reply to ARP requests as that capability is only performed by the master.
Resolution
  • Functions as Designed (FAD)
  • It is recommended to manage the chassis with a physical IP address in this instance rather than the loopback
Additional notes

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