03-01-2010 03:05 AM
I have a pair of Nexus 7k configured for virtual port-channel (with domain, peer-links, pkal, etc.)
I have three Nexus 5k switches dowstream, that I want to connect to both 7k using vPC.
From the documentation I understand that I must use port-channels on both 7k to attach downsream
switches. But it is not clear to me whether I must use separate port-channel for each downstream
switch, or I may bundle all downsream links into a common port-channel on 7k?
E.g., with separate port-channels on N7k-1:
Solved! Go to Solution.
03-04-2010 02:36 PM
As this post is now a couple of days ago you may have already discovered the answer. However, the vPC requires a unique Port-Channel group for each downstream device between the vPC peer devices, the two N7Ks in this case. Essentially you need to configure three port-channels, one for each of your downstream N5Ks on both your N7K vPC peer devices:-
For example:-
N7K-1
N7K-2
.
.
.
.
etc.
Hope this helps
Allan.
03-04-2010 02:36 PM
As this post is now a couple of days ago you may have already discovered the answer. However, the vPC requires a unique Port-Channel group for each downstream device between the vPC peer devices, the two N7Ks in this case. Essentially you need to configure three port-channels, one for each of your downstream N5Ks on both your N7K vPC peer devices:-
For example:-
N7K-1
N7K-2
.
.
.
.
etc.
Hope this helps
Allan.
03-05-2010 02:22 AM
Thank you Allan.
In fact the answer to my question is: Both possible.
-- Separate downstream port-channel (and vpc) per each attached device (as you propose).
-- And common downstream port-channel (and vpc) for a pair of attached N5k on condition
this pair is also configured for vPC. The latter topo is called Double-sided vPC or sometimes
back-to-back vPC, and it uses common vpc id and common Po's between all 4 devices.
The Double-sided vPC has an important advantage (over the topo with separate port-channels)
of permitting port-channel teaming for the hosts dual-homed to n5k's (i.e.load-balancing).
alex
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