I am experiencing severe network performance problems when I connect 3 Cat3524's to 1 Cat4003
(fibre dot1q GBic links).
All in 1 physical loop. The Cat 4003 is the root bridge (connected to router). The bizarre thing is if I disconnect the fibre between the 4003 and the first 3524 (forcing all the traffic the long way round) it all works OK.
Reconnect the fibre and problem reappears. I have replaced the switch, fibre, and GBIC on this first switch and still the problem does not go away.
Is there a compatability issue between 400X and 35XX
I am missing ???
The newer switch which went in has a slighty different revision.
I have tried everything .. 4003 is VTP server rest are clients - Diameter set to 3 on 4003,
The trunk is set to ON on the 4003 so I believe DTP is not an issue.
At least at one time, the 4000 series only supported dot1q trunking and the 3500 series defaulted to ISL. You might want to check to see if there's a mismatch and change the 3500's. I always set trunking on as well.
I don't know whether that explains why it works when you break the loop. Are all the ports on the 3500's in the same VLAN?
Yeap Spanning tree looks OK, its blocking in the right place, I make the 4000 the root, costs all look OK, When I make a topology change and debug Spantree events, I can see it go through the spanning tree rebuilding stages OK. Usually with spanning tree problems it will keep recalulating the topology but it isnt doing that in this case.
It be any comfort, I am in the midst of a very difficult Support issue with two Cat4006/SupII acting as a core with 3524 edge switches, also connected with GE dot1q trunks. STP like symptoms, but no reconfigs jsut like you. This field notice was a good fit but did not fix our problem :
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.