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тАО12-04-2006 07:17 AM
тАО12-04-2006 07:17 AM
stp
we've got fiber connecting far ends of our campus buildings. as a redundant link, incase our fiber is cut by a contruction crew, etc. we have a wifi bridge from the 2 end points.
the majority of our data was using the 1gb fiber (along the right side of the image attached) - but we recently rebooted some of the HPs, and now the primary 'route' used is over our much slower wifi bridge (ie: it's a 99% capacity, when our fiber is almost dark LOL)
in the attached image, the switch at A is a 2626, at B it's a 2650, and at C it's a 2626 - all with the latest firmware as of late October.
can you tell me where to look for how to tell my A & B switches to prefer the fiber route? (STP is not on C, just A and B, so i assume i tell B port 50 costs less than port 1, and same idea for switch A - use port 25 over port 2) - just can't find where to do this via telnet.
thanks.
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тАО12-04-2006 07:19 AM
тАО12-04-2006 07:19 AM
Re: stp
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тАО12-04-2006 08:07 AM
тАО12-04-2006 08:07 AM
Re: stp
spanning-tree
You can adjust path selection by changing the path-cost or priority.
This is described in detail in the advanced traffic management guide.
Anders :)
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тАО12-04-2006 09:49 AM
тАО12-04-2006 09:49 AM
Re: stp
the priority was 8 for both routes, so i changed to 6 on the fiber at both ends, and that seemed to do it.
thanks, i was looking for STP, but because my models weren't mentioned here: ftp://ftp.hp.com/pub/networking/software/6400-5300-4200-3400-AdvTrafficMgmt-Oct2006-59906051-Chap06.pdf i passed over that doc, but it lists what you say :)
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тАО12-05-2006 04:03 AM
тАО12-05-2006 04:03 AM
Re: stp
http://www.hp.com/rnd/support/manuals/
There you'll find the Adv. Traffic Mgmt. guide for the 2600 series.
Anders :)
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тАО12-05-2006 02:12 PM
тАО12-05-2006 02:12 PM
Re: stp
One area of concern I see is the link you have blocked out in the lower middle area. The connectivity beyond C-24 and B-49. By not including C in the spanning tree you are relying on the switch to bridge BPDUs for you. I have seen this work before, but at the expense of higher CPU load with odd anomalies that were difficult to debug. It is best to use ST on all switches where loops can occur.
I work for HP, but my posts and replies are my own.
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тАО12-05-2006 02:41 PM
тАО12-05-2006 02:41 PM
Re: stp
when i introduced my last 2626 there, configured as the others (stack member, STP on, my 2 vlans (1 for authorized machines using radius, 9 for all others) nodes on the far end (clients connected to C) couldn't reach servers connected to A.
i tried rebooting C and then A to no avail. so i disabled STP on C - that's when these lost souls got back online, but the wifi link was over utilized.
should i prompt my master to refresh the tree in a manual way when turning stp 'back on' on device C ?
thank you again.
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тАО12-05-2006 03:25 PM
тАО12-05-2006 03:25 PM
Re: stp
I'm having a bit of trouble visualizing your spanning tree environment, so I'll assume that the WIFI link is between A-2 and C-23.
If that is the case, your goal should be to make sure that WIFI link has the highest path cost to your root. I assume that when you say "master" you are referring to your root or the switch with the highest priority (the lowest number).
When you have clients that can't reach their destination, try using SHOW SPAN (abbreviated) to see which ports are blocking/forwarding. There are other commands that can be used to drill down deeper into how STP is operating. With a little experimentation, I'm sure you can find where the trouble is.
I work for HP, but my posts and replies are my own.