12-03-2009 08:11 AM - edited 03-06-2019 08:49 AM
Suppose I have two Catalyst 6509 switches in VSS
configutatoin. I have one point-to-point circuit that comes into po
rt1/1/2 of the active chassis. What happens if the supervisor engine of the active chassis fails?
Will the stand-by chassis take over and somehow use the port of the failed chassis?
Thanks,
MAQ
Solved! Go to Solution.
12-03-2009 08:53 AM
Mohamad,
No, when the primary or secondary switch fails, none of the ports for that particular switch are useable, that is why for example if you are connecting your servers to a VSS set, you should always use 2 NICs from each server, one connects to one 6500 and the other connects to the other 6500. This way you have switch redundancy (VSS) and also NIC redundancy.
Also, if you are connecting your edge devices, you should uplink you edge device two different 6500 using EtherChannel.
HTH
Reza
12-03-2009 08:32 AM
Hello MAQ,
When you configure 2 Cisco 6500 switches as VSS, they are physically to devices, but logically one device. So when the primary box fails the secondary box will take over the responsibility without any down time. Also in VSS pair you only have access to the primary and not the secondary
Another word, the configs of both switches are merged and you configure every thing from the primary device until the primary fails. The concept is similar to stacking 3750 switches together, but VSS is for bigger switches.(6500s only)
Please refer to this document for more info:
HTH
Reza
12-03-2009 08:38 AM
Thank you, Reza.
So if the primary switch fails. will we be somehow able to use the blades or ports that are on the primary switch.
For example:
SW1 --> primary/active
SW2 --> stand by
SW1 --> fails
SW2--> primary/active
Will be able to use a port of SW1?
Thanks,
Mohamad
12-03-2009 08:53 AM
Mohamad,
No, when the primary or secondary switch fails, none of the ports for that particular switch are useable, that is why for example if you are connecting your servers to a VSS set, you should always use 2 NICs from each server, one connects to one 6500 and the other connects to the other 6500. This way you have switch redundancy (VSS) and also NIC redundancy.
Also, if you are connecting your edge devices, you should uplink you edge device two different 6500 using EtherChannel.
HTH
Reza
12-03-2009 08:57 AM
Thank you, Reza. That is what I had thought.
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