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New Member

6500 arp problem catos 8.1(3)

I have one 6509 (core L3 router) switch with sup2/msfc2 running 12.1(13)E11 connected to two 6513's running catos 8.1(3).

We recently change the management vlan ip addresses on all three switches. The 6509 and one of the 6513's operates normally, but one of the 6513's seems to lose arp entries for our management stations. Which causes us to lose the ability to telnet to this switch. We can telnet to the core 6509 and then to the 6513. And if we ping our workstations from the suspect 6513 we then can telnet directly to it. But if we disconnect from the 6513 and wait a few minutes, we again lose connectivity.

Has anyone experienced this issue??

Thanks

8 REPLIES
New Member

Re: 6500 arp problem catos 8.1(3)

Any update on this...what was teh problem?

New Member

Re: 6500 arp problem catos 8.1(3)

Still experiencing the problem. No one has posted any suggestions. Currentlly have a TAC case open without any satisfaction.

Bronze

Re: 6500 arp problem catos 8.1(3)

You need to give us some IP address info, SC0 address and default route info to think through this.

Re: 6500 arp problem catos 8.1(3)

And can you check ARP aging timer? (ah arp)

New Member

Re: 6500 arp problem catos 8.1(3)

The arp aging timer is set to 1200 sec

cam timer set to 300 sec

IP info follows:

original

6509 - 10.10.97.1/24 - vlan 97

6513a - 10.10.97.3/24 - sc0 gateway - 10.10.97.1

6513b - 10.10.97.4/24 - sc0 gateway - 10.10.97.1

new

6509 - 10.10.0.1/24 - vlan 10 (vlan97 deleted)

6513a - 10.10.0.16/24 - sc0 gateway - 10.10.0.1

6513b - 10.10.0.17/24 - sc0 gateway - 10.10.0.1

Doing a trace on sc0 on the suspect switch (6513b) shows that it does not see any arp broadcasts when we

try to ping the device from our workstations. We can see the broadcasts if we span the trunk port on 6513b but we don't see it on sc0. When we connect a workstation to a port on the 6513b switch and configure it for vlan 10 and span that port, we also don't see any arp broadcasts when doing a trace.

Thanks.

Anonymous
N/A

Re: 6500 arp problem catos 8.1(3)

Do a show config on the 6513 not working and what does it show for sc0's vlan?

New Member

Re: 6500 arp problem catos 8.1(3)

It shows Vlan 10

Thnx

New Member

6500 arp problem catos 8.1(3)

Same problem but no workaround... Can you provide the solution please?

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