1) what does the command "spanning-tree extend system-id" do?
2) we do not use vlan 1 for any data/voice traffic (on other vlan's). Can I disable vlan 1 from spanning tree? and what happens if I prune vlan 1 from the trunk ports to other switches? Will this stop the CDP traffic and all the other behind-the-scenes traffic from traversing our switches?
3) what does "spanning-tree optimize bpdu transmissions" do?
2). Yes, You can disable Vlan1 from STP.If you prune the vlans from the trunk the CDP or management traffic will pass over the native vlan defined on the switch. There are some IOS which supports this , this feature is called as Vlan1 minimization.It is supported mostly on newer IOS.Check also the switch model numbers that you have for the support of this feature.
2)I think VTP at least still uses vlan 1, even when vlan 1 is disabled on a trunk. Basically, there are two kinds of traffic on a port, control and data traffic. When vlan 1 is disabled, only data traffic is blocked for vlan 1. The port is still configured to receive control traffic. But that's a minor point, basically, VTP and CDP should still work once vlan 1 is disabled.
3) This is an engineering command. It should never have appeared in the configuration (the fact this command shows up in the config is actually a bug). The command is disabling a specific way of sending periodic BPDUs (I don't want to enter into the detail) for troubleshooting purposes only. You can ignore this. If you have a recent IOS version, you can remove this from the config.
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.