From: Devender Singh (devender.singh@xxxxxxxxxxxxxx)
Date: Mon Sep 17 2001 - 09:57:20 GMT-3
Hai everyone I wish to discuss these two scenarios, in regards to largest
frame size in dlsw. In both scenarios assume the R1 and R3 to be peers.
Scenario 1:
(TR)--- R1---serial--- R2 ---ethernet---R3---(TR)
TCP:
In this case TR interface on R1 and R3 will have MTU of 4K. Maximum path MTU
is 1500(ethernet). So for TCP we configure " ip tcp mtu-path " and lf will
end up to be 516 (because next higher lf is 1470 and when you add to it
diffrent headers packet size will exceeed MTU of 1500) . Now when a device
connects to it partener by sending an explorer, eventually maximum lf will
get negotiated to be 516.
FST:
for similar reasons we will have to manually configure to be 516.
Scenario 2:
ethernet---- R1 ---serial--- R2 --- serial --- R3 ---(TR)
IF LOWEST MTU OF THE PATH IS 1500 OR IF LF ENDS UP TO BE 1470 EVERYTHING
WILL BE SIMILAR TO SCENARIO 1. BUT IF LF IS LARGER THEN:
TCP:
Maximum frame will be negotiated to 1500 ( as this is the maximum mtu
ethernet can support).
FST:
Have to be cofigured to the best LF. If LF is lager than what cloud can
support, although peers will be formed but, sessions will not establish.
CAN someone correct me in my understanding if I am wrong.
Devender Singh
BE(Hons), CCNP
IP Solution Specialist
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