From: Annu Roopa (annu_roopa@xxxxxxxxx)
Date: Sat Feb 23 2002 - 10:46:50 GMT-3
John,
Thanks for replying.here is how its connected.Let me
try textual explanation.
1.Access layer switch is where hosts are.
2.Uplink fast on the access layer switch.
3.The connection to 6509 is layer 2 without
channeling.
4. Access layer connected to 2 core switches which
have the CSM( load balancing blade in 6509).
5. Link to left switch fails (this is Spantree Root
now).
6. Due to UPlinkfast the Right core switch becomes
Root.
7.When link comes back up agian the Root flips to left
core switch and we loose flows for around 20 seconds.
hope this helps.thanks in advance for ur answers.
Bye
Annu
--- John Mistichelli <jmistichelli@yahoo.com> wrote:
> I am not sure we have a clear picture of how you
> are wired. Is Uplinkfast configured on the switch
> you expect to be the root bridge (and backup to the
> root)? If so, its not designed for that. Uplinkfast
> is for access layer switches.
> John
> Rich <rmallory@enteract.com> wrote: Question(s):
>
> Are the uplinks from the closet switches single
> connections to the 2 core
> switches or are you using Etherchannel on the
> uplinks to each core switch?
> How many VLAN's are being used in the closet switch?
> Are the root bridges
> for the VLAN's placed on the core switches to enable
> spanning tree load
> balancing? If not, which core is root for the VLAN
> you are testing from, and
> does it matter which of the links drops? In other
> words does the problem
> occur if the link which comes back up is connected
> to the root bridge?
>
> Thanks,
>
> Rich
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> Annu Roopa
> Sent: Friday, February 22, 2002 2:10 PM
> To:
> Cc: annu_roopa@yahoo.com
> Subject: OT:Uplinkfast issues
>
>
> Group,
>
> I have a issue with one of the setups hopefully
> someone has come across this or has some ideas ?
>
> My setup is as follows:
>
> Firewall1 Firewall2
> | |
> | |
> Cat6509(with CSM) Cat6509 (with CSM)
> Primary Backup
> | |
> | <--Uplinkfast -->| Layer2
> ---- ----- conn
> | |
> |----------|
> | Switch |
> ============
> PC Hosts
>
> My issue is when link to Cat6509 which is primary
> (with CSM blade) fails the Uplinkfast fails over to
> secondary and traffic goes thru Backup Cat6509 and
> goes well.
>
> The PROBLEM IS WHEN THE LINK TO OLD PRIMARY comes
> back...upkink fast takes around 30 seconds and
> meanwhile traffic in terms of flows is lost.
>
> Is there a way to speed up this process in any way ?
>
> Let me know the connection between access switch and
> Cat6509 is Layer 2 and cannot be Layer 3 connection
> as
> per requirements.
>
> Thanks in advance for ur answers.
> Annu
>
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