VSS seteup configuration best practice

[Santosh Shetty]

I am trying to setup lan with 4507 and 3850 stack. I am able to setup VSS between two 4507 using configuration as follows.

sw1
conf t
hostname SW1

switch virtual domain 10
switch 1
exit

int port-channel 5
switchport
switch virtual link 1
no shut
exit

interface range ten1/12,ten2/12,ten3/4,ten3/5
switchport mode trunk
channel-group 5 mode on

switch convert mode virtual

**********************************************
sw2

conf t
hostname SW2

switch virtual domain 10
switch 2
exit

int port-channel 10
switchport
switch virtual link 2
no shut
exit

interface range ten1/1,ten2/1,ten3/4,ten3/5
switchport mode trunk
channel-group 10 mode on

switch convert mode virtual

Q1: What other configuration can be done to optimize the setup?

Q2: How to setup ether-channel between two uplink from 3650 stack.? 

[Reza Sharifi · Accepted solution]

Hi,

in addition to the VSL link you also need a link (copper 1gig) between the 2 switches for fast-hello.

see link below:

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/XE3-5-0E/15-21E/configuration/guide/config/vss.html#pgfId-1425634

As for the Portchannel between the 3650 stack and VSS, best practice is the way you have connected in the picture. I think the only protocol supported between stack and VSS is LACP.

So configure the Portchannel using LACP, with VSS as active and stack as passive.

HTH