Hi all, I have a problem with my network, it seems like everything in vlan 1 on my 3 switches is running very slow, I have ran ethereal, and used my monitoring software on the switch to check errors, bandwidth etc but nothing is showing abnormal, but pinging anthing on the LAN is taking between 300 and 3000ms, is there anything that would cause this???? there is no loops as spanning tree is enabled and not blocking.
they are some switches that I have just taken over, they are nortel 450T, I normally use cisco so Im new to them, spanning tree is enabled on them and surely if there was a loop it would of been blocked ?? if im using ethereal what should I be looking for ??
Cisco and Nortel deal with Spanning Tree in totally different ways (almost 90 degrees).
Cisco does Per VLAN Spanning Tree as default, Nortel puts all the VLANs in one spanning tree instance by default, as one example.
Cisco includes all VLANs in a trunk port unless EXCLUDED, Nortel EXCLUDES all VLANs ina "tagged" port unless included..
And don't even get started with "etherchannel" vs what Nortel calls "trunking" (link aggregation) and compatibility..
If things were running before and you don't/haven't added/removed/changed VLANs on ports, then this might not be the problem, but if you do, it can create a huge STP loop problem.
I've run into compatibility issues before, and usually, the easiest way to troubleshoot is to not have to go cross-vendor... Other option would be to use access ports (instead of trunk ports) on a single VLAN to link the 450T up to the core, that would eliminate some of the STP agita that can occur.
Do a show process cpu and show process memory to give you an idea as to what might be causing the slow response. You may also have excessive errors on some ports in VLAN 1 that may be causing excessive retransmits and slowing the network down....Keep us posted....
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.