Eigrp nei is not active

Answered Question
Apr 13th, 2010
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Hi all,


i have two routers on same network


Router 2650  config



router eigrp 50
network 192.168.1.0
auto-summary


2650xm#            sh ip eigrp nei
IP-EIGRP neighbors for process 50
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
0   192.168.1.40            Fa1/0             11 00:11:05  348  2088  0  3
2650xm#            sh ip eigrp topo
2650xm#            sh ip eigrp topology
IP-EIGRP Topology Table for AS(50)/ID(10.10.10.10)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 192.168.1.0/24, 1 successors, FD is 28160
        via Connected, FastEthernet1/0


*******************************************************************************


Router 2620



router eigrp 50
network 192.168.1.0
auto-summary




2620Router# sh ip eigrp nei
IP-EIGRP neighbors for process 50


H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
0   192.168.1.1             Fa0/0             14 00:12:05    1  3000  0  9



2620Router#sh ip eigrp topology
IP-EIGRP Topology Table for AS(50)/ID(2.2.2.2)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 192.168.1.0/24, 1 successors, FD is 28160
        via Connected, FastEthernet0/0



2620Router#sh 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 not set

C    2.0.0.0/8 is directly connected, Loopback0
C    192.168.1.0/24 is directly connected, FastEthernet0/0
2620Router#


As shown above  on 2620 routers routing table it is not showing D eigrp only showing static ?

any idea why it is like this?


i know in ospf and rip we can use default info originate from main router which option can we use on 2650 core router so router 2620 learn routes by

eigrp?


many thanks

mahesh

Correct Answer by Giuseppe Larosa about 7 years 3 months ago

Hello Mahesh,


as Jon has noted you need to advertise some other IP subnet in order to see EIGRP updates exchanged and EIGRP routes installed in the routing table.


The use of loopback interfaces is very handy for this kind of things allowing to emulate several remote networks


Probably the two are not even sending out an EIGRP update in current scenario, but they just exchange EIGRP hello messages and they have become neighbors.


Edit:


>> P which is passive do you why it do not show them as Active??


passive in good news, Active would be bad news it would mean the router is trying to find an alternate path and has started a Query process.

passive state is the correct one



Hope to help

Giuseppe

Correct Answer by Jon Marshall about 7 years 3 months ago

Mahesh


As shown above  on 2620 routers routing table it is not showing D eigrp only showing static ?

any idea why it is like this?


You will only see D routes with EIGRP if the 2650 is advertising those routes and this does not include the directly connected networks.


Do this on 2650


int loopback 10

ip address 192.168.5.1 255.255.255.0


router eigrp 1

network 192.168.5.0


you should then see this as an EIGRP route on the 2620.


Jon

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Correct Answer
Jon Marshall Tue, 04/13/2010 - 10:51
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Mahesh


As shown above  on 2620 routers routing table it is not showing D eigrp only showing static ?

any idea why it is like this?


You will only see D routes with EIGRP if the 2650 is advertising those routes and this does not include the directly connected networks.


Do this on 2650


int loopback 10

ip address 192.168.5.1 255.255.255.0


router eigrp 1

network 192.168.5.0


you should then see this as an EIGRP route on the 2620.


Jon

mahesh18 Tue, 04/13/2010 - 11:14
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Hi Jon,


thanks for reply i did that and now i see D   in routing table of 2620




2620Router#sh 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 not set

C    2.0.0.0/8 is directly connected, Loopback0
D    192.168.5.0/24 [90/156160] via 192.168.1.1, 00:02:29, FastEthernet0/0**********************
C    192.168.1.0/24 is directly connected, FastEthernet0/0
2620Router#


but when i ran command below it shows  2 networks and both as
P which is passive do you why it do not show them as Active??


2620Router#sh ip eigrp topology
IP-EIGRP Topology Table for AS(50)/ID(2.2.2.2)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 192.168.1.0/24, 1 successors, FD is 28160
        via Connected, FastEthernet0/0
P 192.168.5.0/24, 1 successors, FD is 156160
        via 192.168.1.1 (156160/128256), FastEthernet0/0
2620Router#


thanks

mahesh

Correct Answer
Giuseppe Larosa Tue, 04/13/2010 - 11:16
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Hello Mahesh,


as Jon has noted you need to advertise some other IP subnet in order to see EIGRP updates exchanged and EIGRP routes installed in the routing table.


The use of loopback interfaces is very handy for this kind of things allowing to emulate several remote networks


Probably the two are not even sending out an EIGRP update in current scenario, but they just exchange EIGRP hello messages and they have become neighbors.


Edit:


>> P which is passive do you why it do not show them as Active??


passive in good news, Active would be bad news it would mean the router is trying to find an alternate path and has started a Query process.

passive state is the correct one



Hope to help

Giuseppe

mahesh18 Tue, 04/13/2010 - 11:34
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Hi guislar


thanks for explanation


regards


mahesh

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