Foundry Networks FESX - Page 126

Foundry Configuration Guide for the FESX, FSX, and FWSX
7 - 32 © Foundry Networks, Inc. December 2005
• Synced and Agree – When all the ports on the bridge assert their synced signals, the new Root port asserts
its own synced signal and sends an RST BPDU to Port4/Switch 60 that contains an agreed flag (Figure 7.11).
The Root port also moves into a forwarding state.
Figure 7.12 Rerooted, Synced, and Agreed
The old Root port on Switch 200 becomes an Alternate Port (Figure 7.13). Other ports on that bridge are elected
to appropriate roles.
The Designated port on Switch 60 goes into a forwarding state once it receives the RST BPDU with the agreed
flag.
Switch 200
Switch 400
Switch 300
Port1
Port1
Rerooted
Synced
Discarding
Port2
Rerooted
Synced
Discarding
Port2
Port3
Port3
Rerooted
Synced
Discarding
Switch 60
Port4
Designated port
Forwarding
Port2
Designated
port
Port2
Root port
Port4
Root port
Rerooted
Synced
Forwarding
BigIron
RST BPDU
sent with
an Agreed
flag
Indicates a signal
Proposing
Switch 100