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Configuring Dial Services

9-32

117353-B Rev. 00

Setting the Maximum Receive Unit (MRU)

In BayRS Version 12.00, the default Maximum Receive Unit (MRU) parameter

value for PPP is 1500, for compatibility with RFC 1661. If you have a network

with both Version 11.02 (or later) and pre-11.02 Bay Networks routers, or

Corporate LAN Access Module (CLAM™) routers configured with

dial-on-demand, standby, or dial backup circuits, make sure that the value you set

for the mru parameter is the same for the central-site router and the remote-site

routers.

To accomplish this task, consider one of the following options:

• Upgrade all routers to Version 11.02 (or later) simultaneously.

Bay Networks strongly recommends this option.

• Upgrade the central-site router to Version 11.02 (or later), leaving the

remote-site routers untouched. Then change the default MRU value on the

central-site router to 1590 bytes.

• As you upgrade each remote-site router software to Version 11.02 (or later),

set its MRU value to 1590, unless you can segregate the 11.02 (or later)

remote sites into their own demand pool. You can do this if some of the

remote-site routers are CLAM routers, provided they are running a CLAM

release prior to 3.522R. CLAM routers running software earlier than 3.522R

let you set the default MRU value to 1590.

• If some remote-site CLAM routers are running release 3.522R, then you

cannot set the MRU value to 1590. In this case, isolate those CLAM routers in

their own demand pool on the Version 11.02 (or later) router and set the MRU

value of that pool to 1500.

• Upgrade the central-site router to Version 11.02 (or later), and set the default

MRU value to 1500. Then reconfigure all remote-site routers dialing into that

demand pool with the same MRU value. For routers earlier than Version

11.02, change the MRU setting to 1500.

• For the router earlier than Version 11.02, change the MRU value in the Sync

Driver MTU attribute (the 1510 value becomes 1500 after subtracting CRC

and PPP headers) to 1510. CLAM routers running Release 3.52R use the

default setting of 1500.

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