VSS SUP redundancy

Answered Question
Apr 21st, 2010

HI,

Can anyone please reply to my question below?

In VSS mode,tipically, Active and Standby chassis have one SUP each.

Is it possible that the chassises have two SUPs each?

e.g.)

Switch_1 is Active and Switch_2 is Standby.

Switch_1 has two SUPs as ACT and STBY.

When Switch_1's ACT fails, Switch_1's STBY becomes active before switch over to Switch_2.

Thank you for your reply.

Akira

I have this problem too.
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Correct Answer by Jon Marshall about 6 years 7 months ago

Akira

Have a look at Table 1 from the VSS Q&A -

VSS Q&A

basically you can only have one supervisor per chassis with VSS although Cisco do say this will be changed in future releases.

Jon

Correct Answer by krahmani323 about 6 years 7 months ago

Hello Akira,

Not at this time.

According to the following Q&A link (http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps9336/prod_qas0900aecd806ed74b.html)

Q. What are the  hardware and software requirements and restrictions for VSS?

Supervisor  Engine

Virtual Switching  Supervisor 720-10GE (VS-S720-10GE-3C and VS-S720-10GE-3CXL)

Note: Initial release  supports a single supervisor engine per virtual switch member  (or chassis). This restriction will be removed in a future software  release.

The current VSS is currently as follows (http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html#wp1054558)

A VSS operates stateful switchover (SSO) between the active and standby  supervisor engines. Compared to standalone mode, a VSS has the following  important differences in its redundancy model:

The active and standby supervisor  engines are hosted in separate chassis and use the VSL to exchange  information.

The active supervisor engine controls  both chassis of the VSS. The active supervisor engine runs the Layer 2  and Layer 3 control protocols and manages the switching modules on both  chassis.

The active and standby chassis both  perform data traffic forwarding.

If the active supervisor engine fails, the standby supervisor engine  initiates a switchover and assumes the active role.

Kind regards.

Karim

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Correct Answer
krahmani323 Wed, 04/21/2010 - 00:42

Hello Akira,

Not at this time.

According to the following Q&A link (http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps9336/prod_qas0900aecd806ed74b.html)

Q. What are the  hardware and software requirements and restrictions for VSS?

Supervisor  Engine

Virtual Switching  Supervisor 720-10GE (VS-S720-10GE-3C and VS-S720-10GE-3CXL)

Note: Initial release  supports a single supervisor engine per virtual switch member  (or chassis). This restriction will be removed in a future software  release.

The current VSS is currently as follows (http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html#wp1054558)

A VSS operates stateful switchover (SSO) between the active and standby  supervisor engines. Compared to standalone mode, a VSS has the following  important differences in its redundancy model:

The active and standby supervisor  engines are hosted in separate chassis and use the VSL to exchange  information.

The active supervisor engine controls  both chassis of the VSS. The active supervisor engine runs the Layer 2  and Layer 3 control protocols and manages the switching modules on both  chassis.

The active and standby chassis both  perform data traffic forwarding.

If the active supervisor engine fails, the standby supervisor engine  initiates a switchover and assumes the active role.

Kind regards.

Karim

Correct Answer
Jon Marshall Wed, 04/21/2010 - 00:46

Akira

Have a look at Table 1 from the VSS Q&A -

VSS Q&A

basically you can only have one supervisor per chassis with VSS although Cisco do say this will be changed in future releases.

Jon

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