Need to confirm if EIGRP is running or not

[mahesh18]

                   Hi all,

On layer 3 device need to confirm if EIGRP is running on router or not and it has nei or not  and it is doing routing or not?

sh ip eigrp nei shows

sh ip eigrp nei

EIGRP-IPv4 neighbors for process 500

sh ip route shows only static and connected routes.

Gateway of last resort is 10.x.x to network 0.0.0.0

S*   0.0.0.0/0 [1/0] via 10.x.x.x

Device has config

ip default-gateway 192.x.x.x

router eigrp 500

network 10.0.00

network 172.0.0.0

Thanks

mahesh

[John Blakley · Accepted solution]

Mahesh,

You should get neighbors back if you have adjacencies. The eigrp process 500 means that you have "router eigrp 500" configured on the device. The static route could override any learned routes from the eigrp process because of the lower AD. The eigrp process is running, but it doesn't seem to have any adjacencies. You'd need to have another router on the other end running the same eigrp process with a common subnet between to form an adjacency.

HTH,

John

[mahesh18]

Hi John,

Thanks for reply.

Also device has many ip  route  statements.

when i do sh ip eigrp int it shows

                       Xmit Queue   Mean   Pacing Time   Multicast    Pending

Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes

Lo3               0        0/0         0       0/1            0           0

Tu3               0        0/0         0      70/70          0           0

Vl530              0        0/0         0       0/1            0           0

so this confirms that EIGRP is running on interfaces but no packets are exchanged  right ?

Also when we have configured static routes like

ip route x.x.x.x *******************1

ip route x.x.x.x

ip default-gateway x.x.x.x ********************2

And

sh ip route shows

Gateway of last resort is 10.x.x to network 0.0.0.0 ********************3

S*   0.0.0.0/0 [1/0] via 10.x.x.x

so in this case how which gateway device will choose to route packets to  1 ,2 or 3?

Thanks

Mahesh

[John Blakley · Accepted solution]

If you have routing enabled, which you would need to have a true routing table, the device doesn't use the "ip default-gateway" statement. It will use the static route that you have in the routing table to route default traffic.

As far as eigrp, you have no neighbors so you wouldn't have any eigrp routes in the routing table. To see this, do a "show ip route eigrp" and you shouldn't get anything back.

John

[mahesh18]

Hi John,

I did show ip route eigrp and it was blank.

so as per you currently device is forwarding packets based on static route statements only like

ip route x.x.x.x right?

Also it should we safe if i remove commands ip default-gateway  and router eigrp from the device?

Thanks

MAhesh

[John Blakley · Accepted solution]

Mahesh,

Personally, I can't tell you to remove anything since I'm not 100% certain about your environment. What I can tell you is that the "ip default-gateway" command is used when routing is not enabled. Theoretically, you should be able to move this command. As far as eigrp, it's been configured on the device for a reason, so you may want to find out if it's supposed to have an adjacency with other devices before removing it. As far as I can tell, it's not doing anything at the moment. Can you post "show ip route"?

HTH,

John

[mahesh18]

here is info

Gateway of last resort is 10.x.x.x.x to network 0.0.0.0

     10.0.0.0/23 is subnetted, 2 subnets
S       10.0.152.0 [1/0] via 10.0.254.13
S       10.0.122.0 [1/0] via 10.0.254.13
S    10.0.0.0/16 [1/0] via 10.0
     10.0.0.0/16 is variably subnetted, 4 subnets, 2 masks
C       10.0.155.0/24 is directly connected, Vlan53
S       10.0.35.0/24 [1/0] via 10.0
S       10.0.27.0/24 [1/0] via 10.0
S       10.0.101.0/28 [1/0] via 10.0
     10.0.0.0/16 is variably subnetted, 8 subnets, 2 masks
S       10.0.155.0/24 [1/0] via 10.0
S       10.0.253.0/24 [1/0] via 10.0
S       10.0.27.0/24 [1/0] via 10.0
S       10.0.29.0/24 [1/0] via 10.0
S       10.0.0.0/24 [1/0] via 10.0
C       10.0.101.16/28 is directly connected, Vlan51
S       10.0.101.0/28 [1/0] via 10.0
S       10.0.107.0/24 [1/0] via 10.0
     10.0.0.0/16 is variably subnetted, 3 subnets, 2 masks
S       10.0.251.0/24 [1/0] via 10.0
C       10.0.254.0/24 is directly connected, Vlan52
S       10.0.252.0/23 [1/0] via 10.0
     10.0.0.0/8 is variably subnetted, 8 subnets, 3 masks
C       10.0.31.4/32 is directly connected, Loopback4
S       10.0.16.4/32 [1/0] via 10.0
S       10.0.31.0/24 [1/0] via 10.0
S       10.16.9.0/24 [1/0] via 10.0
S       10.0.3.0/24 [1/0] via 10.0
S       10.0.33.0/24 [1/0] via 10.0
S       10.0.100.0/24 [1/0] via 10.0
C       10.0.254.12/30 is directly connected, Tunnel3
S*   0.0.0.0/0 [1/0] via 10.x.x.x.x
S    10.0.0.0/12 [1/0] via 10.0

Thanks

MAhesh

[John Blakley · Accepted solution]

Mahesh,

It's safe to say that you don't have any eigrp learned routes. If you truly know that you're not supposed to run eigrp, you can safely remove the eigrp configuration from the router.

HTH,

John

[mahesh18]

Many thanks again John.

Regards

MAhesh

[Abzal · Accepted solution]

Hi Mahesh,

If in routing table see routes like this it means no EIGRP adjacencies were formed. There several reasons for that, neighbors are not on the same common subnet, EIGRP AS number different or wrong. K values do not match, authentication doesn't match.

Yes, packet forwarding currently based only on static routes.

You can safely remove ip default-gateway. This command for L2 switches. Because they are not aware of routing. So they need to know default-gateway L3 device to properly forward packet.

Hope it will help.