We have a pair of CSS (model 11503) configured as an active/standby pair using redundant VIPs and interfaces. Each CSS has connections to the same four subnets for which one CSS is the Master and the other Backup.
This all works fine but when I recently connected another gigabit interface on each CSS to a new subnet, the two CSS failed to see each other and both came up as Master. To eliminate the switches they were connected to as the possible cause, I reconnected them to a single standalone switch but the same problem resulted. The CSS could not ping each others interface either. I think it could be something to do with ARP entries and collected the information below.
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On what should be the Master CSS:
sh arp
10.185.2.20 00-0e-d7-c7-9f-19 dynamic 3/2
sh virt
Interface Address: 10.185.2.10 VRID: 100
Priority: 254 Config. Priority: 254
State: Master Master IP:
10.185.2.10
State Changes: 9 Last Change: 05/16/2007
06:23:08
Preempt: False Last Fail Reason: Critical
Phy Down
Last Clearing of Stat Counters: 05/10/2007 18:16:07
Critical-Reporters:
css-failover-3 State: Up Type:
critical-phy-all-up
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On what should be the Backup CSS
sh arp
10.185.2.10 00-0e-d7-c7-9e-18 dynamic 3/2
sh virt
Interface Address: 10.185.2.20 VRID: 100
Priority: 253 Config. Priority: 253
State: Master Master IP:
10.185.2.20
State Changes: 12 Last Change: 05/16/2007
06:24:20
Preempt: False Last Fail Reason: Critical
Phy Down
Last Clearing of Stat Counters: 05/10/2007 18:18:40
Critical-Reporters:
css-failover-3 State: Up Type:
critical-phy-all-up
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On the 3750M switch they both connect to
1 0000.5e00.0164 DYNAMIC Gi1/0/1
1 000e.d7c7.9e18 DYNAMIC Gi1/0/1
I noticed there was no entry for 000e.d7c7.9f19 which I would have expected to see.
Packets are being sent and received between the ports
