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NX-5K-2(config-sync-sp)# sync-peers destination 10.0.0.1
Those IP addresses correspond to the management interfaces on the Nexus 5000s.
Now here it gets a little weird for me. For commands to sync, they cannot exist in the
running config. If you want to edit an existing switch config, you can import the running
config, or parts thereof, into your switch profile. I recommend only doing this for the
interfaces or FEXs for which you will be syncing, because otherwise you’ll spend hours
trying to figure out why it’s not working. There are many commands that are not supported
within config-sync and, as of now, the list is not well documented. Keep it
simple, and stick to port channels and FEXs.
So I’ve decided that I’d like to sync port channel 10, which is already configured.
Great—all I have to do is import it, and then I can use config-sync. The caveat here is
that I cannot import a configuration after I’ve configured the config-sync peer. The
good news is that I should only need to import once, since from that point on, I’ll have
config-sync managing my relevant interfaces and FEXs, assuming I was smart enough
to import everything I needed up front. I’m showing you this specifically because it’s
wrong, and because it took me days of lab time and calls to Cisco TAC to figure it out.
Let’s go ahead and import the configuration for port channel 10. Here, I’m importing
on NX-5K-2, but I’ll need to do it on both switches anyway:
NX-5K-2(config-sync-sp)# import interface po10
NX-5K-2(config-sync-sp-import)#
Seems simple enough. Anytime there are changes in the config-sync buffer, we should
verify them. If the commands won’t verify, they won’t sync:
NX-5K-1(config-sync-sp-import)# verify
Failed: Verify Failed
I hate when that happens. That’s not a very helpful message, either. How can we figure
out what the problem is The first step is to see what’s in the buffer with the show
switch-profile profile-name buffer command:
NX-5K-1(config-sync-sp-import)# sho switch-profile GAD buffer
switch-profile : GAD
----------------------------------------------------------
Seq-no Command
----------------------------------------------------------
1 interface port-channel10
1.1 switchport mode trunk
1.2 vpc 10
1.3 switchport trunk allowed vlan 10, 20, 30, 40
1.4 speed 1000
That all looks pretty good, but there’s still no indication of why it’s failing. Here’s the
output of the same command from NX-5K-1:
NX-5K-1(config-sync-sp-import)# sho switch-profile GAD buffer
switch-profile : GAD
Nexus Design Features | 303