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

might be interrupted because the local VLAN-to-instance mapping is different from that on a

neighbor device. Perform these operations with caution.

• To make digest snooping take effect, you must enable it both globally and on associated ports. HP

recommends that you enable digest snooping on all associated ports first and then globally. This

will make the configuration take effect on all configured ports and reduce impact on the network.

• To avoid loops, do not enable digest snooping on MST region edge ports.

• HP recommends you to enable digest snooping first and then the spanning tree feature. To avoid

traffic interruption, do not configure digest snooping when the network is already working well.

Configuration procedure

You can enable digest snooping only on an HP device that is connected to a third-party device which

uses its private key to calculate the configuration digest.

To configure digest snooping:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enter interface view or port

group view.

• Enter Ethernet interface view or Layer 2

aggregate interface view:

interface interface-type interface-number

• Enter port group view:

port-group manual port-group-name

Use one of the commands.

3. Enable digest snooping on

the interface or port group.

stp config-digest-snooping

By default, digest snooping

is disabled on a port.

4. Return to system view.

quit N/A

5. Enable global digest

snooping.

stp config-digest-snooping

By default, digest snooping

is disabled globally.

Digest snooping configuration example

Network requirements

As shown in Figure 20, Router A and Router B connect to Router C, which is a third-party device. All these

routers are in the same region.

Enable digest snooping on the ports of Router A and Router B that connect to Router C, so that the three

devices can communicate with one another.