Hello -
I have two 2501's in a basic lab setup, connected to each other's S1 via DCE/DTE cable. The serial interfaces' link state will not change to up. Here are the abbreviated configs:
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hostname TopRouter
interface Serial1 ip address 172.16.0.2 255.255.255.0 clockrate 56000 ! router rip network 172.16.0.0 network 172.18.0.0
HD unit 1, idb = 0x263BC8, driver structure at 0x26B6F0 buffer size 1524 HD unit 1, V.35 DCE cable, clockrate 56000 cpb = 0xE2, eda = 0x3140, cda = 0x3000
Ethernet0 172.18.0.2 YES NVRAM up up
Serial0 unassigned YES NVRAM administratively down down
Serial1 172.16.0.2 YES NVRAM up down
**************************hostname BottomRouter ! interface Serial1 ip address 172.16.0.1 255.255.255.0 ! router rip network 172.16.0.0 network 172.18.0.0 !
HD unit 1, idb = 0x263BC8, driver structure at 0x26B6F0 buffer size 1524 HD unit 1, V.35 DTE cable cpb = 0xE2, eda = 0x3140, cda = 0x3000
Ethernet0 172.18.0.1 YES NVRAM up up
Serial0 unassigned YES NVRAM administratively down down
Serial1 172.16.0.1 YES NVRAM up down
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If I issue a shutdown on s1, and then follow up with a no shutdown, the interface will change its link state to up, but only for a few seconds.
The same issue occurs if I change the configurations to use Serial 0 on both routers.
Any idea what is going on here?
Thanks
-tom