serial-link address

From: yungli2008@gmail.com
Date: Wed Aug 20 2008 - 13:23:32 ART


Hi experts

I am facing this in dynamip with c3640-jk9o3s-mz.124-16.bin IOS

here is my scenario

R4(S1/1)---PPP----(s1/1)R5

R4
int s1/0
ip add 163.1.45.4 255.255.255.0
encap ppp
no sh

R5
int s1/0
ip add 163.1.45.5 255.255.255.0
encap ppp
no sh

---------------

R4
Rack1R4(config)#do sh ip rou con
     163.1.0.0/16 is variably subnetted, 6 subnets, 2 masks
C 163.1.45.5/32 is directly connected, Serial1/1
C 163.1.45.0/24 is directly connected, Serial1/1
C 163.1.0.0/24 is directly connected, Serial1/0

R5
Rack1R5(config-if)#do sh ip rou con
     163.1.0.0/16 is variably subnetted, 6 subnets, 2 masks
C 163.1.45.4/32 is directly connected, Serial1/1
C 163.1.45.0/24 is directly connected, Serial1/1
C 163.1.0.0/24 is directly connected, Serial1/0

---------------

Why the interface serial 1/1 shows two mask?

If i changed the encapsulation ppp to default hdlc then it shows single mask.

Would you please anyone explain me?

Advance thanks
Li

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