11-30-2016 12:36 PM
I'm evaluating the Nexus 2248TP Fabric Extenders as replacement for our older 3750E and 2960 switches. I have the 2248 uplinked to a pair of 5548s, both switches report the Fex "online" and successfully bundled the ports in to a vPC. Everything seems to work fine.
Where I'm confused on is configuration - since this is not shared between the 5548s, what is the source of truth for a port configuration on the Fex with there is disagreement? For example, given this configuration...
N5548-1# show run int e116/1/1
version 7.0(8)N1(1)
interface Ethernet116/1/1
switchport access vlan 111
spanning-tree port type edge
N5548-2# show run int e116/1/1
version 7.0(8)N1(1)
interface Ethernet116/1/1
switchport access vlan 222
spanning-tree port type edge
Will this port be in vlan 111 or vlan 222?
11-30-2016 12:47 PM
When you dual home your FEXes to 2 5ks, in order for the ports to work correctly they must have identical configs on both switches. So, the config you posted should not work.
5548-1# show run int e116/1/1
version 7.0(8)N1(1)
interface Ethernet116/1/1
switchport access vlan 111
spanning-tree port type edge
N5548-2# show run int e116/1/1
version 7.0(8)N1(1)
interface Ethernet116/1/1
switchport access vlan 111
spanning-tree port type edge
HTH
11-30-2016 12:51 PM
Well yes, but is there a way to guard against this, or auto-sync the configuration between the 5ks?
11-30-2016 01:08 PM
Yes, you can use config sync, so you don't have to do it manually.
here is a link to it
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/operations/n5k_config_sync_ops.html
HTH
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