R3303-HP HSR6800 Routers Layer 2 - LAN Switching Configuration Guide

Figure 20 Network diagram

Configuration procedure

# Enable digest snooping on GigabitEthernet 4/0/1 of Router A and enable global digest snooping on

Router A.

<RouterA> system-view

[RouterA] interface GigabitEthernet 4/0/1

[RouterA-GigabitEthernet4/0/1] stp config-digest-snooping

[RouterA-GigabitEthernet4/0/1] quit

[RouterA] stp config-digest-snooping

# Enable digest snooping on GigabitEthernet 4/0/1 of Router B and enable global digest snooping on

Router B.

<RouterB> system-view

[RouterB] interface GigabitEthernet 4/0/1

[RouterB-GigabitEthernet4/0/1] stp config-digest-snooping

[RouterB-GigabitEthernet4/0/1] quit

[RouterB] stp config-digest-snooping

Configuring No Agreement Check

In RSTP and MSTP, the following types of messages are used for rapid state transition on designated

ports:

• Proposal—Sent by designated ports to request rapid transition.

• Agreement—Used to acknowledge rapid transition requests.

Both RSTP and MSTP devices can perform rapid transition on a designated port only when the port

receives an agreement packet from the downstream device. RSTP and MSTP devices have the following

differences:

• For MSTP, the root port of the downstream device sends an agreement packet only after it receives

an agreement packet from the upstream device.

• For RSTP, the downstream device sends an agreement packet regardless of whether an agreement

packet is received from the upstream device.