R2511-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V5)

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To enable communication between an HP device and a third-party device, enable the digest snooping
feature on the port that connects the HP device to the third-party device in the same MST region.
Configuration prerequisites
Before you enable digest snooping, make sure that associated devices of different vendors are connected
and running spanning tree protocols.
Configuration restrictions and guidelines
• With the digest snooping feature enabled, in-the-same-region verification does not need
comparison of configuration digest, so the VLAN-to-instance mappings must be the same on
associated ports.
• When digest snooping is globally enabled, if you modify the VLAN-to-instance mapping or use the
undo stp region-configuration command to restore the default MST region configuration, traffic
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 that you 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 that uses
its private key to calculate the configuration digest.
To configure digest snooping:
Ste
p
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.