Ppp Lcp Echo Mru Verify - H3C MSR810 Command Reference Manual

Table 13 Command output
Field
Location
VT interface
Unused/State
Related commands
pppoe-server virtual-template va-pool

ppp lcp echo mru verify

Use ppp lcp echo mru verify to enable maximum receive unit (MRU) verification for PPPoE on a
VT interface.
Use undo ppp lcp echo mru verify to disable MRU verification for PPPoE.
Syntax
ppp lcp echo mru verify [minimum value ]
undo ppp lcp echo mru verify
Default
MRU verification for PPPoE is disabled on a VT interface.
Views
VT interface view
Predefined user roles
network-admin
Parameters
minimum value: Specifies the minimum MRU in the range of 64 to 1500 bytes.
Usage guidelines
To support an M TU larger than 1492, PPPoE adds the PPP-Max-Payload option during PPPoE
negotiation. This option identifies the MTU for the current PPPoE session. If the MTU is larger than
1492, PPP uses the MTU as the MRU during LCP negotiation, and reports the MTU after negotiation.
MRU verification prevents the negotiated MRU from exceeding the receiving and sending
capabilities of the interface. If the negotiated MRU is larger than 1492, the PPPoE server sends an
echo request that has the same size as the negotiated MRU. If the PPPoE server receives a reply, it
uses the MRU as the MTU. If the PPPoE server fails to receive a reply, the following situations occur:
• If the minimum MRU is configured, the PPPoE server sends a packet that has the same size as
the minimum MRU.
• If the minimum MRU is not configured, the PPPoE server sends a packet that has the same size
as the negotiated MRU.
Description
Card and CPU where the VA pool resides.
This field is not displayed for centralized devices.
When the field displays a hyphen (-), it indicates a global
VA pool.
If the device cannot display the CPU, an asterisks (*) is
displayed, for example, 1/0/*.
Virtual-Template interface that uses the VA pool.
VA pool capacity available for PPP users/current state of
the VA pool.
• Creating—The VA pool is being created.
• Destroying—The VA pool is being removed.
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