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first of all, you have to assure:
- the chassis model is supporting VSS
- Distributor 2 is not handling any traffic at moment
then follow the bellow steps:
1- If not previously installed, install the new supervisor (VS-SUP720-10G)
2- Copy VSS compatible Cisco IOS software to the sup-bootdisk:
Distribution-2#copy ftp: sup-bootdisk:
3- Update the bootvar to load Cisco IOS software copied to the sup-bootdisk:
Distribution-2(config)#boot system flash sup-bootdisk:s72033-ipservices_wan_vz.122-33.SXH1.bin
4- For the Distribution-2 switch to run in VSS mode, a Virtual Switch Link (VSL) is required. The current Port Channel link between Distribution-1 and Distribution-2 can be utilized to form the VSL.
5- Configure the Virtual Switch attributes:
Distribution-2(config)#hostname VSS
VSS(config)#switch virtual domain xxx
VSS(config-vs-domain)#switch 1
VSS(config-vs-domain)# exit
VSS(config)#interface port-channel 1
VSS(config-if)#switch virtual link 1
VSS(config-if)#interface TenG x/x
VSS(config-if)#channel-group 1 mode on
VSS(config-if)#interface TenG x/x
VSS(config-if)#channel-group 1 mode on
5- Convert the Distribution-2 switch to VSS mode.
VSS#switch convert mode virtual
6- Complete these steps to pre-configure VSS Switch 1:
-Configure MEC.
-Move interface configuration to MEC.
-Move QoS and ACL policies to MEC.
7 - Repeat the conversion steps on the Distribution-1 switch to bring that in preferred VSS standby mode.
Distribution-1(config)#hostname VSS
VSS(config)#switch virtual domain 100
VSS(config-vs-domain)#switch 2
