11-06-2013 10:41 PM - edited 03-04-2019 09:30 PM
Dear all,
we have multiple Links in our network and Running STP to manage it.
but when link changeover, CE Stop communicating to PE until we "shut" and "no shut" on our switch port connected to CE.
if we do not do shut, no shut it takes few hours to start communicating with PE automatically.
please assist
Regards
Vikas kumar
11-07-2013 06:56 AM
Hi,
according to the symptoms, I'd guess some ARP cache problem...
Have you tried to clear arp cache on your CE instead of shut/no shut the port?
Best regards,
Milan
11-07-2013 07:05 AM
Dear Milan,
Yes it is ARP Cache issue.
When client Clear ARP cache on CE it start communicating with PE.
Please assist.
Regards
11-07-2013 07:15 AM
Hi,
now the questions are:
Is it an iBGP or eBGP bewteen your CE and PE?
Direct connection or multiple hops?
Is the BGP session down?
Or just packets routed to the PE are not delivered?
Which ARP entry is changed after the link changeover and why?
Best regards,
Milan
11-07-2013 07:29 AM
Dear Milan,
this is Direct Connection But passing via Multiple switches And eBGP is running between CE and PE.
P2P IP configured between CE and PE.
Regards
vikas
11-07-2013 08:13 AM
Hi,
so do you see the ARP entry for the PE IP address has changed on your CE after the link changeover?
If yes, you need to investigate why.
It should not change if there were a pure L2 connection (even over multiple L2 switches) between them.
Best regards,
Milan
11-07-2013 09:52 PM
Dear Milan,
I have cheked MAC on PE and CE.
Both sides MAC address is correct.
Regards
11-07-2013 11:16 PM
Hi,
so what exaclty happens after the link changeover?
Is the BGP session Down or Up?
Are you able to Ping the PE from the CE?
If not, are the MAC addresses in ARP entries really correct?
Best regards,
Milan
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