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тАО07-23-2007 02:02 PM
тАО07-23-2007 02:02 PM
OSPF ECMP Routing issues
Thanks
Devinder Sharma
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тАО07-23-2007 05:02 PM
тАО07-23-2007 05:02 PM
Re: OSPF ECMP Routing issues
Its very obvious that you have an ECMP network, but i think you have to check all paths from the spanning tree point of view.
So on the 3500s , check both paths to the 5400s and how is the spanning tree behavior, also check the following link it could help:
http://www.hp.com/rnd/support/faqs/5300xl.htm#question105
Also, there was some issues with older firmwares, so if you can update your switches to latests version
Good Luck !!!
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тАО07-24-2007 05:32 AM
тАО07-24-2007 05:32 AM
Re: OSPF ECMP Routing issues
Yes, all switches have the latest image.
There is no spanning tree loop (show span on 5400s and show span instance 1 & 2 on 3500s) and show cpu confirms that and spanning tree is disabled on all uplinks between 3500s and 5400s. Clearly there are two equal cost paths (show ip ospf ext at any 3500 lists LSAs containing the same network from both 5400s but it should move to the routing table as well).
Anything else that I need to verify.
Thanks
Devinder Sharma
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тАО07-24-2007 09:52 AM
тАО07-24-2007 09:52 AM
Re: OSPF ECMP Routing issues
This implies that traffic is balanced on per-destination network basis instead of a per-packet basis.
See page 5-110 in the routing manual.
casevh
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тАО07-24-2007 10:13 AM
тАО07-24-2007 10:13 AM
Re: OSPF ECMP Routing issues
Please advise if this is expected behaviour from OSPF ECMP standards based implementation or it is just how this is implemented in procurve.
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тАО07-24-2007 10:57 AM
тАО07-24-2007 10:57 AM
Re: OSPF ECMP Routing issues
In regards to failover time, I'm using a different configuration for our core. One change I made to improve OSPF convergence time was to change the hello-interval to 1 second and the dead-interval to 4 seconds. It is working fine in a mixed Cisco/HP environment. (I also had to uniformily specify OSPF costs.)
casevh
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тАО07-24-2007 11:30 AM
тАО07-24-2007 11:30 AM