Catalyst ME3600 MHSRP Issue

[Michael Kiessling]

Hi,

I have a basic network setting with three switches connected on one LAN segment. Two of them (ME3600)

are using MHSRP (two groups, each of them active on one switch)

The third switch (LAN-Switch) acts as a default gateway for different Client-LANs and is using the

HSRP virtual IPs for load-balancing:

ip route 0.0.0.0 0.0.0.0 10.0.0.3

ip route 0.0.0.0 0.0.0.0 10.0.0.4

All goes fine for a couple of minutes/hours, then parts of the the Client-LANs lose connectivity (a tracroute

goes up to the LAN-Switch and then times out).

A 'show arp' on the LAN-Switch shows that the mac address for one of the virtual IPs is missing!? As soon as I

ping this adress the mac address is back in the ARP cache.

I already had a look in the Bug ToolKit without any hit for HSRP issues.

What do you think? Could this be a configuration problem (proxy-arp is deactivated on all three switches)?

Please see hsrp.txt for the MX3600 configuration.

Best regards,

Michael

[Michael Kiessling]

No one?

Okay, then I'll go for an IOS update...

[rsimoni · Accepted solution]

Hi Michael,

there 2 HSRP related issue on Me3600x

the first is an external bug while the second is internal

CSCtq14467    Traffic stops on HSRP active interfac after reload (Some times).

CSCto73823    Ping from standby HSRP router and host to HSRP virtual IP fails

They are both solved in EY2 software; so yes an IOS upgrade is the first thing to do as you might be hitting one of those bugs.

Riccardo

[Michael Kiessling]

The switches alread run me360x-universalk9-mz.122-52.EY3.bin, so I will go for 151-2.EY1a.

I'll give feedback if it solved the problem.

Regards,

Michael

[Michael Kiessling]

Solved it!

The problem was not related to the ME36000 switches but to the LAN switch running IOS 12.2(35).

After upgrading it to the latest IOS version everythings runs stable.

Thanks for your input,

Michael

[innetee9228]

Dear M.kiessling

Your problem wasn't originated from ME3600X ?

Which means it wasn't from Bug CSCto73823 related to ME3600X ?

[Michael Kiessling]

Hi innetee9228,

yes that's right. The problem was only originated by the LAN switch (which was running IOS 12.2(35)).

The ME switches were fine.

[innetee9228]

Hi m.Kiessling

Did you find any specific bug in LAN switch ?

I also encountered the same issue. I solved it temporarily by shutdowing the active vlan in HSRP and no shutdown.

Regards