what is difference administrative and operational, in cat3550?

[zesum]

hi

I don't know difference administrative and operational.

Administrative Mode VS Operational Mode ?

Administrative Trunking Encapsulation VS Operational Trunking Encapsulation?

cat3550# show interfaces gigabitethernet0/1 switchport

Name: Gi0/1

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: static access

Administrative Trunking Encapsulation: negotiate

Operational Trunking Encapsulation: native

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Protected: false

Unknown unicast blocked: false

Unknown multicast blocked: false

.....

thanks.

[Prashanth Krishnappa]

Administrative Mode indicates what the interface is capable of doing by default where as Operational mode indicates what it's current mode.

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12112cea/3550cr/cli2.htm#25772

[sbhadrav@cisco.com]

o the best of my knowledge, a trunk is a point-to-point link that sends and receives traffic between switches, or between switches and routers. Trunks carry the traffic of multiple VLANs and can extend VLANs across an entire network. 100Base-T and Gigabit Ethernet trunks use Cisco Inter-Switch Link Protocol (ISL), the default protocol, or industry standard IEEE 802.1q, to carry traffic for multiple VLANs over a single link.

IEEE 802.1q trunks impose these limitations on the trunking strategy for a network:

If the native VLAN on one end of the trunk is different from the native VLAN on the other end, Spanning Tree Protocol (STP) loops might result. Therefore, the native VLAN for an 802.1q trunk must be the same on both ends of the trunk link.

Disabling the STP on the native VLAN of an 802.1q trunk without disabling STP on every VLAN in the network can potentially cause STP loops. It is recommended that you leave STP enabled on the native VLAN of an 802.1q trunk, or disable STP on every VLAN in the network. Make sure your network is loop free before disabling STP.

The best practice is to leave STP on so that it can detect loops that might otherwise cause serious network problems