09-26-2012 06:27 AM - edited 03-07-2019 09:07 AM
Hi All,
when we configure VSS in the Core on 6500 swithces, we make port channel to make bundle the VSS together. what about the confguration on the Access swithces, whihc will be connecting both the Chassis in VSS. do we need the uplinks from access swithces to be configured as port channel bundles? or we can configure the uplink ports as just dot.1q trunks link?
The below config is correct or not? required the Port-channel 1 between the core and the access or not???
On Core
-------------
!
interface Port-channel1
description *** Connects to Ground Floor Cabinet 2 ***
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
port-channel port hash-distribution adaptive
!
interface Port-channel10
description *** Port Channel VSL Link between Core Switches ***
no switchport
no ip address
switch virtual link 1
mls qos trust cos
no mls qos channel-consistency
!
interface Port-channel11
description *** Port Channel VSL Link between Core Switches ***
no switchport
no ip address
switch virtual link 2
mls qos trust cos
no mls qos channel-consistency
!
interface TenGigabitEthernet1/1/4
description *** VSL Link between Core Switches ***
no switchport
no ip address
mls qos trust cos
channel-group 10 mode on
!
interface TenGigabitEthernet1/1/5
description *** VSL Link between Core Switches ***
no switchport
no ip address
mls qos trust cos
channel-group 10 mode on
!
interface GigabitEthernet1/2/1
description *** Connects to GF-Cab02 ***
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode on
!
!
interface GigabitEthernet2/2/1
description *** Second Link Connects to GF-Cab02 ***
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode on
!
On Access Switch
-----------------------------
Dam-Main-GF-C2-SwStack-01#
!
interface Port-channel1
description *** Ether Channel to Core Switch ***
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet1/0/2
description *** Connect to 6504E Core 1 ***
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode on
!
interface GigabitEthernet2/0/2
description *** Connect to 6504E Core 2 ***
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode on
!
Thanks & Regards
Sunny
Solved! Go to Solution.
09-26-2012 06:42 AM
Hello Sunny,
you should configure STP parameters likely making the VSS the root bridge in any case for best practice
Hope to help
Giuseppe
09-26-2012 06:36 AM
Hello Sunny,
you can use a port channel between the access layer switch and the VSS device pair and this is one of the advantages of VSS as it allows to use both uplink links using a multi chassis etherchannel.
You are not obliged to do it. it is usually done as it provides advantages without using the port channel one uplink link would be put in STP alternate state (blocking actually) by STP protocol
Hope to help
Giuseppe
09-26-2012 06:40 AM
Dear Giuseppe,
So in that case we need to configure STP parameteres correctly in the VSS Core Device right?
regards
Sunny
09-26-2012 06:42 AM
Hello Sunny,
you should configure STP parameters likely making the VSS the root bridge in any case for best practice
Hope to help
Giuseppe
09-26-2012 07:13 AM
thanks a lot giusee...
09-28-2012 11:43 AM
Hi Giuasee,
One more thing to rectify. what about the STP configuration on VSS?
when we will configure the STP Parametrs? before making VSS or after makig the VSS as one switch?
I will make the VSS swith as the spanning-tree vlan <1-4096> root primary for all my vlan, then what are the common things we may need to configure on the VSS switch?
appreciate your immedaite response
Thanks & Regards
Sunny
09-28-2012 12:49 PM
Hi Sunny,
It shouldnt matter.
Spanning tree should be running in VSS and NON-VSS so just configure it as normal and then once your running VSS sinply just check spanning tree is running as expected.
If you use "MEC's to all your switches ( port-channels ) then spanning tree shouldnt cause any issues anyway. But its handy to have enabled just incase you get loops for some reason.
09-28-2012 12:59 PM
Hi,
You should make any changes after VSS is configured, if not once VSS is configured, it will override the old config.
HTH
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