IBM SC30-3681-08 Lcp options or parameters, Maximum receive unit, Async Control Character Map

Con®guring PPP Interfaces (Talk 6)

ipv6cp

Sets the IPv6 Control Protocol option for the link.

Example:

set ipv6cp

Send Our IP address [no]:

Send Our IP address

Speci®es whether or not to send the local IPv6 address to the

remote end of the link. Set this option to yes if the other end of the

link requires the IPv6 address.

If this parameter is set to yes, IPv6CP will send the IPv6 address of

the PPP interface, if the interface is con®gured with a numbered

IPv6 address, (that is, the address does not begin with 0). If this

option is set to no and the peer sends us a Con®gure NAK with ::/0

for the IPv6 address option, the 2210 will respond with the address

of the PPP interface if it is con®gured with a numbered address.

lcp options or parameters

Sets the Link Control Protocol options and parameters for the PPP link.

Example:

set lcp options

Maximum Receive Unit (bytes) [2048]?

Magic Number [yes]:

Peer-to-Local Async Control Character Map (RX ACCM) [A0000] ?

Protocol Field Compression (PFC) [no]?

Addr/Cntl Field Compression (ACFC) [no]?

Maximum receive unit

Sets the maximum size of the information ®eld that are transferred

in a single datagram. The range is 576 to 4089 bytes. The default is

2048.

Magic number

Speci®es whether or not the magic number option is enabled. The

magic number provides a way of detecting looped back links in

serial line con®gurations. When this option is enabled, the link uses

the system clock as a random number generator. The random

numbers that are generated are referred to as magic numbers.

When the LCP receives a Con®gure Request with a magic number

present (i.e., the magic number option is enabled), the received

magic number is compared with the magic number in the last

Con®gure-Request sent to the peer. If the two magic numbers are

different, the link is not considered looped back. If the two numbers

are the same, the PPP handler attempts to bring the link down and

up again to renegotiate magic numbers.

Setting this value to Yes enables the magic number option. Setting

this value to No disables the option. The default setting is Yes.

Async Control Character Map

Indicates which characters that the peer must ªescapeº when

transmitting packets to the router on asynchronous lines. This

allows certain sensitive ASCII control characters, such as XON and

XOFF, to be transmitted transparently over the link.

Chapter 33. Con®guring and Monitoring Point-to-Point Protocol Interfaces 479