Re: WS-X45-Sup7-E uplinks during switchover/supervisor failure

RB6502 · ‎12-01-2022

The WS-X45-Sup7-E features 4 x 10Gbps non-blocking switch ports when installed in the 4510R+E chassis. What happens to these ports during: a) a supervisor switchover and b) a supervisor software failure?

For instance, if there are WS-X45-Sup7-E installed in slots 5 & 6, and TenGigabitEthernet5/1 and TenGigabitEthernet6/1 are constituent interfaces of say Po1, what happens during a switchover from say, slot 5 to slot 6? Do both ports continue forwarding during the switchover? How about if the supervisor in slot 5 encounters a software or other failure that causes it to be down after the switchover to slot 6? Will slot 5's interfaces still be forwarding?

Trying to understand the behavior so I can weigh the options of using the supervisor uplink ports vs ports on a "less-complicated" line card.

balaji.bandi · ‎12-01-2022

yes if you enabled NSF - that should forward without any loss. (if the end device connected that Po1) - its like same way the LAG works, if one of the members fails another one still continues to work.

check some NSF guidelines:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/53SG/configuration/config/NSFwSSO.html

BB

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Reza Sharifi · ‎12-01-2022

For instance, if there are WS-X45-Sup7-E installed in slots 5 & 6, and TenGigabitEthernet5/1 and TenGigabitEthernet6/1 are constituent interfaces of say Po1, what happens during a switchover from say, slot 5 to slot 6? Do both ports continue forwarding during the switchover?

Yes, as long as the sups are configured in SSO mode, and are both up and running.

How about if the supervisor in slot 5 encounters a software or other failure that causes it to be down after the switchover to slot 6? Will slot 5's interfaces still be forwarding?

No, if a sup fails, all ports in that sup will go down as well. So, in your case, sup 5 and all uplinks will go down and sup 6 and all its ports will be forwarding.

HTH