05-05-2006 10:53 AM - edited 03-03-2019 03:06 AM
Can someone confirm that uplink/backbonefast works the same on bound etherchannel ports as normal.. ie if I have:
Po25 Root FWD 3 128.808 P2p
Po26 Altn BLK 3 128.816 P2p
If Po25 drops, Po26 will take over, and uplinkfast will help it that much quicker?
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05-05-2006 04:00 PM
You can have both uplinkfast and backbonefast on a switch. The switch running uplinkfast will generally have alternate ports (else uplinkfast is helpless), which means that it won't need backbonefast itself. However, it may run bbfast in order to answer the RLQs from a bridge that does not have any alternate port and that lost its root port.
Regards,
Francois
05-05-2006 11:11 AM
Yes, it does work the same way. Switch would transition the alternate/blocking etherchannel to forwarding state expeditiously when the primary link goes down.
HTH,
Sundar
05-05-2006 11:12 AM
That may very well be correct. Please check this doc on how uplinkfast works:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094641.shtml
You also mention backbonefast and a word of caution might be suitable here: It is generally not a good idea to use uplinkfast AND backbonefast configured together on the same switch. (I have seen it)
If your network can handle it, Rapid Spanning Tree might be a viable alternative.
Regards,
Leo
05-05-2006 01:20 PM
Thanks for the article; I've read quite a bit on uplinkfast, but that one breaks it out quite nice. As to the uplinkfast and backbonefast not being used together, what are the implications? Nothing I've seen says they shouldn't be used together.
I'll have to read up more on rstp.
thanks again,
Brian
05-05-2006 04:00 PM
You can have both uplinkfast and backbonefast on a switch. The switch running uplinkfast will generally have alternate ports (else uplinkfast is helpless), which means that it won't need backbonefast itself. However, it may run bbfast in order to answer the RLQs from a bridge that does not have any alternate port and that lost its root port.
Regards,
Francois
05-05-2006 08:26 PM
The "uplinkfast bridge" actually not only answers RLQs but may also need to originate some...
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