2248 Fabric Extender Dual-Connected to Two Cisco Nexus 5548
I am trying to deploying Dual-Connected to Two Cisco Nexus 5548 with 2248 Fabric Extender. But i am facing an issue when I create VPC between
5548 and 2248 then the Fex disappear and i couldn’t see the Fex in "Show Fex command". Further I have using Single connection from Each Nexus 5548 to both Fex 2248. (See attached Diagram).
But the issue is when I create VPC on nexus side the Fex is disappearing and I couldn’t see any output “show Fex". Kindly see my attached Configuration for both Nexus 5548 and suggest where the issue on config side is.
Further In attached design the both Nexus 5548 are active and can manage the FEX from any one so How i can make proper synchronization between them. Kindly provide some proper Cisco documentation guide to accomplish this task.
Let me review your suggestion and reapply again to attach diagram scenario. But in this scenario how we can syn the both control plan of Nexus 5548? Because from any one of the NK5548 I can see the FEX interfaces of both Nexus 2248 so If i make changes from Nk5548-A then how the change will syn to NK5548-B?
Further I tried a lot to get some configration document regarding the dual connection (attached Diagram) but I could'nt find on cisco can you send me the link information for Dual Home connection VPC
! feature lacp feature vpc feature fex ! vpc domain 55 role priority 8192 system-priority 8192 peer-keepalive destination 10.10.10.2 delay restore 150 auto-recovery ! interface Ethernet1/15 description TO NK5548-B switchport mode trunk speed 1000 channel-group 50 mode active ! interface Ethernet1/16 description TO NK5548-B switchport mode trunk speed 1000 channel-group 50 mode active ! interface port-channel50 switchport mode trunk spanning-tree port type network speed 1000 vpc peer-link !
! feature lacp feature vpc feature fex ! vpc domain 55 role priority 9192 system-priority 8192 peer-keepalive destination 10.10.10.1 delay restore 150 auto-recovery ! interface Ethernet1/15 description TO NK5548-A switchport mode trunk speed 1000 channel-group 50 mode active ! interface Ethernet1/16 description TO NK5548-A switchport mode trunk speed 1000 channel-group 50 mode active ! interface port-channel50 switchport mode trunk spanning-tree port type network speed 1000 vpc peer-link !
At this point you should be able to run the show vpc command and see that the peer status shows as "peer adjacency formed ok", the vPC keepalive status shows the peer as alive, the peer-link is up etc.
Once you have the vPC up and working then you can add the dual homed FEX as follows:
As mentioned previously, from an operational and management standpoint it's probably best to maintain consistency of the interface you use to connect to the FEX i.e., if FEX 100 is connected to N5548-A eth1/1, then also connect it to eth1/1 on N5548-B. Strictly you don't have to do this if you manually apply the configuration to both switches, but you must have consistency if you use the configuration synchronisation feature.
My personal preference is to manually apply the configuration to both Nexus 5K rather than use config-sync. It's not a huge burden and I've seen and read of a number of issues with bugs in config-sync.
The first thing you need to address is the fact that your peer-link is down. If you don't have the vPC peer-link operational then you'll never get other vPC working, including those to the FEX.
When I look through the configuration of NK5548-B I can see that you've created interface port-channel 50 and assigned the vpc peer-link command to this interface, but I don't see any physical interfaces configured as members of that port-channel i.e., with the channel-group 50 mode active command as you have configured on NK5548-A Ethernet 1/15-16.
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