STEP1: Assigning Virtual Switch Domain & Switch Numbers
Domain name must be same on both the switches.
ADM-6509-VSS(config)#switch virtual domain 100
ADM-6509-VSS(config-vs-domain)#switch 1
ADM-6509-VSS(config-vs-domain)#switch 1 priority 110
ADM-6509-VSS(config-vs-domain)#switch 2 priority 100
ADM-6509-VSS-2(config)#switch virtual domain 100
ADM-6509-VSS-2(config-vs-domain)#switch 2
ADM-6509-VSS-2(config-vs-domain)#switch 1 priority 110
ADM-6509-VSS-2(config-vs-domain)#switch 2 priority 100
Highest priority value switch will be the priority. If the priority is not configured, the lowest switch number will be the active switch..
STEP2: Configuring VSL Port Channel
Virtual Switch Link (VSL) is the port channel which the VSS parameters will be exchanged to sync data & management planes. They are configured as L3 port-channels.
ADM-6509-VSS(config)#int port-channel 11
ADM-6509-VSS(config-if)#no switchport
ADM-6509-VSS(config-if)#switch virtual link 1
ADM-6509-VSS-2(config)#int port-channel 12
ADM-6509-VSS-2(config)#no switchport
ADM-6509-VSS-2(config-if)#switch virtual link 2
STEP3: configure the VSL ports
Typically we use 2x10GE links as the members of the VSL portchannel.
ADM-6509-VSS(config)#int range te1/5/4-5
ADM-6509-VSS(config-if-range)#switchport mode trunk
ADM-6509-VSS(config-if-range)#channel-group 11 mode on
ADM-6509-VSS-2(config)#int range te2/5/4-5
ADM-6509-VSS-2(config-if-range)#switchport mode trunk
ADM-6509-VSS-2(config-if-range)#channel-group 12 mode on
STEP4: Converting the Switch to Virtual Switch Mode:
ADM-6509-VSS#switch convert mode virtual
ADM-6509-VSS-2#switch convert mode virtual
If there are no mismatching parameters, switches will reboot after entering this command..
STEP5: Configuring the Dual Active Fast-Hello
MCEC (Multi Chassis Ether Channel) is created like in this diagram. So if the VSL links fail for some reason, SW2 will think the supervisor engine of SW1 is gone and SW2 will also become active. Because both the supervisor engines are active now it can cause routing & switching loops and black holes.
To prevent this we have to configure a dedicated link to monitor the active status of the supervisor engines.
It can be any link, usually a Gig port..
ADM-6509-VSS(config)#switch virtual domain 100
ADM-6509-VSS(config)#switch virtual domain 100
ADM-6509-VSS(config-vs-domain)#dual-active detection fast-hello
ADM-6509-VSS(config)#interface GigabitEthernet1/7/48
ADM-6509-VSS(config-if)#no switchport
ADM-6509-VSS(config-if)#no ip address
ADM-6509-VSS(config-if)#dual-active fast-hello
ADM-6509-VSS(config-if)#interface GigabitEthernet2/7/48
ADM-6509-VSS(config-if)#no switchport
ADM-6509-VSS(config-if)#no ip address
ADM-6509-VSS(config-if)#dual-active fast-hello
When dual-active condition is detected, the original active chassis enters into recovery mode and brings down all of its interfaces except the VSL and excluded interfaces.
Verification Commands
Following outputs are from a currently working VSS..
show switch virtual
show switch virtual role
show switch virtual link
Following outputs are from a currently working VSS..
show switch virtual
show switch virtual role
show switch virtual link
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ReplyDeleteHi, Are these on real gear or simulated on EVE ?
ReplyDeleteCannot simulate this bro, this is real hardware
Delete