Interface direct connected Null0

Ken Lee · ‎06-03-2011

Hi All,

I have 2 Core Switches. The static route for 172.21.124.236 is configured at Core switch 1 because firewall is connected at this core switch 1.

Currently, am not sure why eigrp cannot push this route to Core Switch 1. Any ideas?

RG002#sh ip route 172.21.124.236
Routing entry for 172.21.124.0/22
Known via "eigrp 2", distance 5, metric 3328, type internal
Redistributing via eigrp 4, eigrp 2
Advertised by eigrp 4
Routing Descriptor Blocks:
* directly connected, via Null0
      Route metric is 3328, traffic share count is 1
      Total delay is 30 microseconds, minimum bandwidth is 1000000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes

Thanks,
Regards,

KA

Thotsaphon Lueangwattanaphong · ‎06-03-2011

Hi,

Please post the output of "show ip route 172.21.124.236 255.255.255.255". Did you have "ip summary-address eigrp" applied on core1? Please post the configuraion,excluding sensitive information.

HTH,

Toshi

Ken Lee · ‎06-06-2011

Router001#

sh ip route 172.2.124.236
Routing entry for 172.2.124.0/24
Known via "eigrp 4", distance 170, metric 28416, type external
Redistributing via eigrp 4, eigrp 2
Advertised by eigrp 2
Last update from 146.122.254.14 on GigabitEthernet0/1/0, 7w0d ago
Routing Descriptor Blocks:
* 146.122.252.14, from 146.122.254.14, 7w0d ago, via GigabitEthernet0/1/0
      Route metric is 28416, traffic share count is 1
      Total delay is 110 microseconds, minimum bandwidth is 100000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 1

Router002#sh ip route 172.2.124.236
Routing entry for 172.2.124.0/22
Known via "eigrp 2", distance 5, metric 3328, type internal
Redistributing via eigrp 4, eigrp 2
Advertised by eigrp 4
Routing Descriptor Blocks:
* directly connected, via Null0
      Route metric is 3328, traffic share count is 1
      Total delay is 30 microseconds, minimum bandwidth is 1000000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 0

RC001
------

interface GigabitEthernet0/0/0
ip address 172.1.3.1 255.255.255.248
no ip redirects
no ip proxy-arp
ip wccp web-cache redirect out
ip wccp 90 redirect out
ip flow ingress
ip summary-address eigrp 2 146.120.0.0 255.248.0.0 5
ip summary-address eigrp 2 172.2.124.0 255.255.252.0 5
ip summary-address eigrp 2 172.2.128.0 255.255.240.0 5
negotiation auto
cdp enable
service-policy input INBOUND
service-policy output OUTBOUND
!
interface GigabitEthernet0/0/1
ip address 146.122.254.1 255.255.255.252
no ip redirects
no ip proxy-arp
ip flow ingress
ip summary-address eigrp 2 146.120.0.0 255.248.0.0 5
ip summary-address eigrp 2 172.2.124.0 255.255.252.0 5
ip summary-address eigrp 2 172.2.128.0 255.255.240.0 5
no negotiation auto
cdp enable
service-policy output WAN
!
router eigrp 4
network 146.120.0.0 0.7.255.255
redistribute eigrp 2
passive-interface default
no passive-interface GigabitEthernet0/0/0
no passive-interface GigabitEthernet0/0/1
no passive-interface GigabitEthernet0/0/2
no passive-interface GigabitEthernet0/0/3
no passive-interface GigabitEthernet0/1/0
no passive-interface GigabitEthernet0/2/0
!
!
router eigrp 2
distribute-list prefix DRN_Update out GigabitEthernet0/0/0
distribute-list prefix GRN_Update in GigabitEthernet0/0/0
default-metric 10000 100 255 1 1500
network 172.1.0.0
redistribute eigrp 4
distance 170 172.1.1.52 0.0.0.3 90
passive-interface default
no passive-interface GigabitEthernet0/0/0

Router001#

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

Router002#

interface GigabitEthernet0/0/0
ip address 172.1.3.18 255.255.255.248
no ip redirects
no ip proxy-arp
ip wccp web-cache redirect out
ip wccp 90 redirect out
ip summary-address eigrp 2 146.120.0.0 255.248.0.0 5
ip summary-address eigrp 2 172.2.124.0 255.255.252.0 5
ip summary-address eigrp 2 172.2.128.0 255.255.240.0 5
negotiation auto
cdp enable
service-policy input INBOUND
service-policy output OUTBOUND
!
interface GigabitEthernet0/0/1
ip address 146.121.254.1 255.255.255.252
no ip redirects
no ip proxy-arp
no negotiation auto
cdp enable
service-policy output WAN
!
router eigrp 4
network 146.120.0.0 0.7.255.255
redistribute eigrp 2
passive-interface default
no passive-interface GigabitEthernet0/0/1
no passive-interface GigabitEthernet0/0/2
no passive-interface GigabitEthernet0/0/3
no passive-interface GigabitEthernet0/1/0
no passive-interface GigabitEthernet0/0/0
no passive-interface GigabitEthernet0/2/0
!
!
router eigrp 2
distribute-list prefix DRN_Update out GigabitEthernet0/0/0
distribute-list prefix GRN_Update in GigabitEthernet0/0/0
default-metric 10000 100 255 1 1500
network 172.1.0.0
redistribute eigrp 4
distance 170 172.1.1.52 0.0.0.3 90
passive-interface default
no passive-interface GigabitEthernet0/0/0

Router002#

Ken Lee · ‎06-06-2011

Sorry Thotsaphon,

I just replied the config. anyway for more info, the core switch 1 connecting to Router 001and core switch 2 connecting to Router 002. And the route should be 172.2.124.236 which not able to go back to Core switch 1 .

I need to throw to Core Switch1 as it is connecting to this network range. The core switch 1 only have this static route. But I am not sure why it is not able to route to Core Switch 1 , instead it stuck at Router 002 . For your info, Router 001 and Router 002 they are interconnect and routes are sent across to each other.

Let me know if oyu need more info.

Thnaks,

KA

ashok_boin · ‎06-06-2011

Hi Kent,

I feel the problem with summarization at EIGRP which by default suppresses the component routes.

Can you please try to utilize "leak-map" feature in "ip summary-address eigrp" command to advertise specifically

172.2.124.0/24?

Please check the following lab note for an example how leak map works...

http://www.networkers-google.com/nwgoogle/Routing/EIGRP/All%20about%20EIGRP%20Route%20Sum1305799297.html

Regards...

-Ashok.

With best regards...
Ashok

Ken Lee · ‎06-06-2011

Thanks. I will check it this through.

Btw,

What about removing the below at core router 1?

Router001#

interface GigabitEthernet0/0/1

ip address 146.122.254.1 255.255.255.252

no ip redirects

no ip proxy-arp

ip flow ingress

ip summary-address eigrp 2 146.120.0.0 255.248.0.0 5

ip summary-address eigrp 2 172.2.124.0 255.255.252.0 5

ip summary-address eigrp 2 172.2.128.0 255.255.240.0 5

What is the impact of doing this?

Ken Lee · ‎06-07-2011

Anyone can help me?

Thotsaphon Lueangwattanaphong · ‎06-07-2011

Hi Ken,

Please post a diagram,including ip address scheme. Please explain about your question in detail. You're using 2 eigrp processes on the router. I just want to know the detailed information and exact problems to solve your question.

Toshi