Recently I needed to renew my Cisco CCNPs, that is both CCNP Routing and Switching as well as CCNP Security. While working with Cisco products (well now they own SourceFire, so exclude these) is not within my daily duties, I still thought it was important for me to maintain these two credentials. As a result, I've put together my notes below focusing on the key points I used to study. I believe that someone else may find them useful.
- IEEE 802.1Q switches maintain one spanning-tree per VLAN0002
- Non-Cisco devices might support one spanning-tree instane for all VLANs
- Native VLANs need to be the same on both ends of the 802.1Q trunk
- If the Native VLAN is different on the links, spanning-tree loops might result
- Disabling spaning-tree on the native vlan without disabling spanning-tree on all other VLANs can cause spanning-tree loops
- Default interface mode is "dynamic auto"
- Default trunk encapsulation "negotiate"
- Allowed VLAN range 1 - 4094
- VLAN range eligible fo pruning 2 - 1001
- VLAN 1 is the default for all access ports
- VLAN 1 is the default native VLAN
References:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/swvlan.html
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