From: Rajat Chauhan (rachauha@cisco.com)
Date: Sun Dec 09 2007 - 12:00:34 ART
Pardon me, its "decrease" and not "disable" in the first line.
rajat
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Rajat Chauhan
Sent: Sunday, December 09, 2007 8:28 PM
To: ccielab@groupstudy.com; cisco@groupstudy.com
Subject: Q.Uplinkfast on two vlans
Hi Experts,
If the question asks to disable the forwarding delay in case of uplink
failure for 2 vlans, we use uplinkfast for that. However, uplinkfast is
enabled globally and for all vlans. So please suggest the best option:
1. Enable uplinkfast globally, ignoring the fact that the question asks
for 2 vlans.
2. Make priority for other vlans 0 so that this switch becomes the root
for them and uplnkfast can run for the only remaining 2 vlans. But again,
that's wrong cos some where it may be most likely mentioned to make specific
switches as root.
3. Disable stp for other vlan (except these two), again seems a drastic
one, considering we have 3 trunks carrying these vlans
4. Manually increase vlan priority to 49152 and port cost to 3000 for
these 2 vlans, but that doesn't takes care of the multicast frame that
switch sends to age out (rather change) the CAM entries to point to correct
uplink switch.
Please suggest.
Thanks
Rajat Chauhan
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