Synchronization Of Port Roles - Cisco 7604 Configuration Manual

Ios software configuration guide

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Understanding RSTP

Figure 19-4 Proposal and Agreement Handshaking for Rapid Convergence

DP = designated port

RP = root port

F = forwarding

Synchronization of Port Roles

When the router receives a proposal message on one of its ports and that port is selected as the new root

port, the RSTP forces all other ports to synchronize with the new root information.

The router is synchronized with superior root information received on the root port if all other ports are

synchronized. An individual port on the router is synchronized if:

If a designated port is in the forwarding state and is not configured as an edge port, it transitions to the

blocking state when the RSTP forces it to synchronize with new root information. In general, when the

RSTP forces a port to synchronize with root information and the port does not satisfy any of the above

conditions, its port state is set to blocking.

After ensuring that all of the ports are synchronized, the router sends an agreement message to the

designated router corresponding to its root port. When the routers connected by a point-to-point link are

in agreement about their port roles, the RSTP immediately transitions the port states to forwarding. The

sequence of events is shown in

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

That port is in the blocking state.

It is an edge port (a port configured to be at the edge of the network).

Configuring Standard-Compliant IEEE MST

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