Port States: in STP= blocking, listening, leaning and forwarding
Port Roles: STP=root, designated,
| STP | 802.1d-1998 | |
|---|---|---|
| disable | no STP or RSTP enable | |
| Blocking State | drop data frame don't send BPDU Only listen BPDU | |
| Listening | Drip data frame send cfg BPDU ( Mcst: 01:80:C2/00:00:00 + link local scope ) + Bridge ID or BID: priority + Mac@ Default BID= 32K | use for election of Root bridge Lowest BID win |
1- set the port priority: default 1G= 20K and 10G= 2K 2- send in the BPDU "root path cost" locally calculate the root path cost, Select the Port Roles: lowest root path cost win 3- update the BPDU | ||
| Learning | ||
| 15sec | ||
| forwarding | ||
