RSTP answer to BLOCKING is ALTERNATE
Port states – disabled, blocking and listening are combined into DISCARDING
DISCARDING to LEARNING to FORWARDING
Edge and Point to Point ports are connected to a single host.
If a BPDU is received on an edge port, the port is demoted to a regular RSTP port and generates a TCN BPDU.
P2p ports is any port running in Full Duplex mode
RSTP considers a topology change to be a port that moves into Forwarding mode
Switch that discovers the topology change will send a BPDU with the TC bit set
RSTP switches generate a BPDU every 2 seconds regardless of receiving a BPDU from the root switch
RSTP misses 3 BPDUs and will immediately age out the superior BPDUs info
UplinkFast, Portfast, BackboneFast are all built into RSTP and no config required
MST = 802.1s – multiple VLANs to be mapped into 1 instance of STP
For MST to agree:
- 1. The MST config name
- 2. The MST instance to VLAN mapping table
- 3. The MST config revision number
Up to 16 instances of MST can exist in a region
- Turn on MST
- Create a REGION
- Create a REVISION number
- Create a INSTANCE and map VLANs
Etherchannels use an algorithm ‘Exclusive OR’ (XOR) to determine which channel in the EC to use to transmit data to the remote switch.
Values to match: Remote port group number and Device ID of all remote ports must be the same.
IF you change the physical speed on 1 interface in a Pagp bundle, this will reflect on the logical po interface
802.3d – LACP
Allows 16 ports , but only 8 ports will go into the bundle with the lowest port priority
PAGP – Dynamic and Auto, Dynamic will negotiate and Auto will wait for the remote switch to instruct
LAGP uses Active and Passive modes
ON option is with NO negotiation