VPC to non Nexus2k

[WILLIAM STEGMAN]

Is it possible to create a VPC to a non Nexus 2k switch, like a blade switch 3110X, or 4510R-E, or do VPCs only work on Nexus2ks (FEX) switches?

thank you

Bill

[Jon Marshall]

Bill

Yes, asboslutely. vPCs simply allow you to terminate the portchannel across 2 separate physical Nexus switches. So you would simply configure your etherchannel as normal on your 4510 for example but at the Nexus end the physical links from the 4510 would be split between the 2 Nexus switches.

Obviouslt the advantage of this is that all links in the etherchannel are forwarding to both Nexus switches without the need for STP to block and you still haev redundancy in case of physical link failure.

Jon

[WILLIAM STEGMAN]

my physical link is showing up, but the po interface is showing down. 

Here's the Nexus side

interface Ethernet1/8

description Link to 4510 port 6/1

switchport mode trunk

switchport trunk native vlan 99

channel-group 40 mode active

HBG-Nexus5k-1# sh int e 1/8

Ethernet1/8 is up

interface port-channel40

switchport mode trunk

switchport trunk native vlan 99

spanning-tree port type network

HBG-Nexus5k-1# sh int po40

port-channel40 is down (No operational members)

Here's the 4510 side

interface TenGigabitEthernet5/1

switchport trunk native vlan 99

switchport mode trunk

channel-group 40 mode on

end

interface Port-channel40

description Trunk to Nexus5ks

switchport

switchport trunk native vlan 99

switchport mode trunk

end

HBG-4510R-E#sh int tenGigabitEthernet 5/1

TenGigabitEthernet5/1 is up, line protocol is up (connected)

and on the 4510 the po interface shows up and connected...

HBG-4510R-E#sh int po40

Port-channel40 is up, line protocol is up (connected)

thank you

[Reza Sharifi · Accepted solution]

On the Nexus side you configured the portchannel as active.  This is LACP

channel-group 40 mode active

On the 4500 side you configured the portchannel as on. This is non-negotiable.

You need to make both sides the same.  If you configure the Nexus for LACP (active) then configure the 4500 also for LACP (passive)

HTH

[WILLIAM STEGMAN]

working, thank you!