VSS Question

Answered Question
Nov 9th, 2009
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Greeting all,


Just a question about VSS, if i have a redundant supervisor and since VSS doesn`t support Redundant Sup so waht is the best practise with it since our customer has already ordered a second Sup for each 65xx and does VSS still work if the sup still plugged in the switch or it has to be removed


Thanks for your help guys

Correct Answer by Giuseppe Larosa about 7 years 8 months ago

Hello Seifeddine,

support for redundant supervisor on same chassis can be on the roadmap.


But if it is not supported I think the only option is to to have it unplugged you cannot know if having it plugged can create problems.


about active sup crash in VSS follow the recommendations in config guide for dual active detection.

have dedicated links to run BFD and/or Fast hellos.


see


http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html#wp1063892


GE links should be good for active/active detection.


also have at least one 10GE link in VSL bundle that is taken from a WS-6708 or WS-6716 to allow interchassis communication in case one supervisor fails totally.


be aware that WS 6704 is not suitable to be used for VSL link because it misses the ASIC chip that encapsulates frames and internal traffic inside VSS frames.


Edit:

in case you haven't the WS-6708 or WS-6716 in your chassis I would consider to send back the two redundant supervisors and to get two WS-6708.


Hope to help

Giuseppe




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Seifeddine-Tlili Mon, 11/09/2009 - 07:40
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Another question came to my mind which i beleive is a restriction to VSS, what happen is the supervisor in the active switch will crash this means that i`m going to loose my connection to the line cards that i have and the standby switch can no longer communicate and take control over those line cards any solution to overcome this issue


Thanks

Correct Answer
Giuseppe Larosa Mon, 11/09/2009 - 07:48
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Hello Seifeddine,

support for redundant supervisor on same chassis can be on the roadmap.


But if it is not supported I think the only option is to to have it unplugged you cannot know if having it plugged can create problems.


about active sup crash in VSS follow the recommendations in config guide for dual active detection.

have dedicated links to run BFD and/or Fast hellos.


see


http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html#wp1063892


GE links should be good for active/active detection.


also have at least one 10GE link in VSL bundle that is taken from a WS-6708 or WS-6716 to allow interchassis communication in case one supervisor fails totally.


be aware that WS 6704 is not suitable to be used for VSL link because it misses the ASIC chip that encapsulates frames and internal traffic inside VSS frames.


Edit:

in case you haven't the WS-6708 or WS-6716 in your chassis I would consider to send back the two redundant supervisors and to get two WS-6708.


Hope to help

Giuseppe




Seifeddine-Tlili Mon, 11/09/2009 - 12:28
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Thanks! spcially for the note regarding the WS 6704 since i haven`t find this anywhere :) in the website


Thanks again

Seifeddine-Tlili Mon, 11/09/2009 - 12:39
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Just a note that i went through the DocCD of cisco and my scenario correspond to Chassis failure and not Dual active mode though thanks for the information.


Thanks

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