EIGRP - cbtv3 VID 40 - 41 - 42 - 43 ​- Verification commands

Question 1

> Show ip EIGRP neighbors

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Answer 1

H = handle - order it’s learnt the routes

Address. = is address
Interface. = int port

Hold uptime = how long until neighbor is dead.

Uptime = how long neighbor has been up.

SRTT = source round trip timer. How long the it take router to get to neighbour and back - to not conflict with hellos timer and if there is a slow link to the other side.

RTO =(Retransmision Timeout), this is the period of time the router waits before retransmitting a packet that has already been sent over a connection-oriented protocol

Q = count stands for the no. of eigrp packets( query,reply,update)which this device is trying to send to next device

Seq = is the sequence number of the last EIGRP packet received
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Question 2

> Show ip EIGRP interfaces

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Answer 2

Peers = number of peers
Pending routes = how many route to send, in case there is a backup and queued to send.
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Question 3

To check load balancing is working ?

Answer 3

> show ip route
D 172.16.2.0 [90/2681856] via 172.16.5.1
[90/2681856] via 172.16.4.1

The above show 1 route learnt from 2 places (next hop)

The above is auto load balancing done without any extra config
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Question 4

How to clear EIGRP neighbour?

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Answer 4

# > clear ip EIGRP neighbour
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> clear ip route
would do the same also
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Question 5

How to check 2nd best routes

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Answer 5

> show ip EIGRP topology

Codes: are a good guide

P 192.168.1.0/24 1 successors, FD is 2809856
Via 72.16.4.1 (280../229..)
Via 172.16.5.1 (372../229..)

Explanation below of show cmd
P = passive
192.168.1.0/24 = is the route it’s learnt (destination)
Via two paths
280 is the feasible distance
229 is the advertised distance
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Question 6

How to verify un-equal cost load balancing routes ?

Answer 6

> show ip route
will show both route to the destination
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> show ip route
D 172.16.2.0 [90/2681856] via 172.16.5.1
                     [90/2699991] via 172.16.4.1
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Question 7

How to check hello and dead timers?

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Answer 7

Hello timer
> Show ip EIGRP interface details s1/1

​It will show Hello timer
Hello interval =
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dead timer is 3 times the hello (99% of the time)

Question 8

How to check Dead timer ?

Answer 8

Keep hitting
> Show up EIGRP neighbour
We will notice hold timer jump from 10-15 secs
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(this is for the default times)

Question 9

> Show ip route

Answer 9

D 10.0.0.0 [90/2195455] via.....
D = EIGRP
90 = administrative distance
2195444 = is the metric cost
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