I am in the process of migrating from S-Series to VSPs in a datacenter environment.
We had an existing VRRPv2 configuration for some of the subnets, and we added the new VSPs into these as part of the migration.
We ran into problems when disabling interfaces on the S-Series in order to decommission it - when shutting down two specific interfaces a lot of servers became unreachable.
When looking at the S-Series, while VRRP appears to be configured correctly, the ARP entry that the S-Series has for the VRRP IP address points to one of its own MAC addresses and not a standard VRRP MAC (00-00-5e....).
Even though the S-Series is not VRRP master in these two subnets, and one of the VSPs is, significant number of our servers have this local MAC address in the ARP entry for their default gateway, so they will lose network connectivity for some period of time when we remove the S-Series.
How can I get the S-Series to present the correct MAC address?
Or how can we complete the migration without servers losing connectivity?
Config etc. below:
S8(rw)->show running-config interface vlan.0.1960
configure terminal
!
interface vlan.0.1960
ip address 10.10.152.220 255.255.255.0 primary
vrrp create 4 v2-IPv4
vrrp address 4 10.10.152.1
vrrp priority 4 200
vrrp preempt-delay 4 65
vrrp accept-mode 4
vrrp fabric-route-mode 4
vrrp enable 4
no shutdown
exit
!
exit
!
S8(rw)->show arp 10.10.152.1
FLAGS: U = Unresolved S = Static
L = Local V = VRRP
* = Stale B = Best Guess Interface
H = Host Interest 2 = Secondary VLAN Entry
IP Address Hardware Address Flg Age Updated Interface Port
--------------- ----------------- --- ---------- ------- -------------- --------
-----
10.10.152.1 20-b3-99-54-d6-b2 L 11h55m - vlan.0.1960 host.0.1
--------------- ----------------- --- ---------- ------- ----------- -----------
--
ARP Entries Found: 1
S8(rw)->show ip vrrp vlan.0.1960 verbose
Interface: vlan.0.1960
VRID: 4
Version: 2, State: FabricRoute
Time of last state transition: MON SEP 26 03:49:43 2022
Master IP Address : 10.10.152.249
Primary IP Address: 10.10.152.220
Virtual MAC Address: 00:00:5E:00:01:04
Advertisement Interval: 1.00 seconds
Master Advertisement Interval: 0.00 seconds
Master Priority: 210, Operational Priority: 200, Configured Priority: 200
Accept: yes, Preempt: yes, Preempt time: 65 seconds
Fabric-Route-Mode: yes
Host-Mobility: no, State: down, ACL:
Interface Up Delay: 0 seconds
Virtual IP Count: 1, Enabled Virtual IP's: 1, Critical IP Count: 0
Virtual IP Addresses Admin State Owner
10.10.152.1 enabled up no
Critical IP Addresses:
Interface Critical Priority Probe
Admin State
