12-10-2012 01:08 PM - edited 03-07-2019 10:31 AM
Hello,
I have two (2) Cisco 3640 connected over a Serial/T1 Line with the configuration below: I would expect that the routing table would show the connected route in both routers (10.0.3.16/29) which it does, but the routing table also reports the ip addresses of each router's serial interfaces as a host route 10.0.3.18/32 (Highlighted in Red in the routing table) in the router's configuration below and 10.0.3.17/32 at the other end.
Any ideas! Why?
---------------------------------------------------------------------------------------------------------------
interface Serial1/0
ip address 10.0.3.17 255.255.255.248
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
encapsulation ppp
load-interval 30
service-module t1 clock source internal
service-module t1 timeslots 1-24
!
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 10.0.3.9
ip route 10.0.3.24 255.255.255.248 10.0.3.18
ip route 10.3.0.0 255.255.0.0 10.0.3.18
3640#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.0.3.9 to network 0.0.0.0
10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C 10.0.3.8/29 is directly connected, FastEthernet0/0
S 10.3.0.0/16 [1/0] via 10.0.3.18
S 10.0.3.24/29 [1/0] via 10.0.3.18
C 10.0.3.16/29 is directly connected, Serial1/0
C 10.0.3.18/32 is directly connected, Serial1/0
S* 0.0.0.0/0 [1/0] via 10.0.3.9
12-10-2012 01:50 PM
You can use "no peer neighbor-route" on the serial interface to remove this. It's used when, in the case of IP unnumbered, two ends of the link aren't on the same subnet.
HTH,
John
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