Hi,

Looking for a quick pointer here, I need to get a remote SPAN session active 
from one of our ASR9K units across a few Cat6K chassis and into an analyser. We 
use RSPAN across all the 6Ks without any issues, and from my understanding the 
ASR needs to egress the captured packets out of a sub-interface and tag them 
with the RSPAN vlan which the 6K is expecting. Then the 6K will flood the 
packets in the RSPAN vlan and get them to our analyser like normal. Now on the 
assumption that is correct so far, I’ll move on to the actual issue.

The only link between this particular ASR and the Cat6k is via a 4x10GB 
bundle-ether, which has a number of sub-interfaces on it. The spanning feature 
on the ASR does not support egress mirroring to a destination port which is a 
bundle-ether, which is handy – so, the question is, what if I were to target 
the egress towards one of the physical 10GB member ports within the bundle, as 
a sub-interface of the physical port? From the Cat6k perspective it won’t care 
as the packets are arriving it will just forward them on the RSPAN vlan. So the 
only (big) issue is whether or not the ASR will be happy to have one port 
within the bundle setup to egress mirrored packets?

Oh, and I'm familiar with the mirror-to-pseudowire method, but in this scenario 
it isn't a particularly nice option for reasons not covered above.

So - any thoughts or suggestions are most welcome - Cheers!


Robert Williams
Custodian Data Centre
Email: rob...@custodiandc.com
http://www.CustodianDC.com


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