4000 Router Series Layer 2 - WAN Configuration Guide

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Ste

Command

Remarks

10. Set the MTU size of the

interface.

mtu size The default setting is 1500 bytes.

11. Set the expected bandwidth

of the interface.

bandwidth bandwidth-value

By default, the expected

bandwidth (in kbps) is the interface

baud rate divided by 1000.

12. (Optional.) Restore the default

settings for the interface.

default N/A

13. Bring up the interface.

undo shutdown By default, an interface is up.

14. Return to system view.

quit N/A

15. Enter interface view.

interface interface-type

interface-number

N/A

16. Assign the interface to a

specified MP-group interface,

enabling the interface to

operate in MP mode.

ppp mp mp-group mp-number

By default, an interface operates in

PPP mode.

Configuring short sequence number header format negotiation

By default, an MP bundle receives and transmits fragments with long sequence numbers.

• If the local end wants to receive fragments with short sequence numbers, it should request the peer

to transmit short sequence numbers during LCP negotiation. After the negotiation succeeds, the

peer transmits fragments with short sequence numbers.

• If the local end wants to transmit fragments with short sequence numbers, it should ask the peer to

send a request for receiving short sequence numbers during LCP negotiation. After the negotiation

succeeds, the local end transmits fragments with short sequence numbers.

The sequence number format (long or short) of an MP bundle depends on the configuration of the first

channel joining the MP bundle.

To negotiate the use of short sequence numbers on a dialer MP bundle, configure the command on the

dialer interfaces and the ISDN D channels; to do that on a common MP bundle, use the command on all

its channels. Note that the command will cause PPP re-negotiation.

To configure short sequence number header format negotiation for MP:

Ste

Command

Remarks

1. Enter system view

system-view N/A

2. Enter interface view.

interface interface-type

interface-number

N/A

3. Trigger MP short sequence number

header negotiation, specifying that the

interface receive fragments with short

sequence numbers after the

negotiation succeeds.

ppp mp short-sequence

By default, long sequence

number header format

negotiation is performed.