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Host Route

abbas.ali
Level 1
Level 1

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

1 Reply 1

John Blakley
VIP Alumni
VIP Alumni

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

*** Please rate all useful posts ***

HTH, John *** Please rate all useful posts ***
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