OK to set the hello interface under the interface do
ip hello-interval "AS" "seconds" - the default will depend on the underlying media it is typically 5 seconds
but for nbma wan connections it is 60 seconds
Hold time - Is advertised in the hello packet it has a different meaning than in ospf. In eigrp the hold time
is you telling the neighbor how long the neighbor should wait before declaring the neighbor down. Not
how long you will wait. When you configure hold time it will not affect you locally it will affect your neighbor
ip hold-time eigrp "AS" "seconds" typically 3 times the hello interval so 15 seconds typically or 180 seconds on wan nmba interface
TIMERS DO NOT HAVE TO MATCH TO FORM ADJACENCY
LAB
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We will have sw3 connected to both r4 and r5 running eigrp we will change the the hello and hold + watch see how it affects
r4#sh ip eigrp int
IP-EIGRP interfaces for process 1
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0/0 2 0/0 430 0/1 0 0
r4#sh ip eigrp int detail
IP-EIGRP interfaces for process 1
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0/0 2 0/0 430 0/1 0 0
Hello interval is 5 sec
Next xmit serial <none>
Un/reliable mcasts: 0/0 Un/reliable ucasts: 1/30
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 7
Retransmissions sent: 8 Out-of-sequence rcvd: 1
Authentication mode is not set
we can see the hello interval is 5 seconds on r4
i will change the hello interval
r4(config)#int fa0/0
r4(config-if)#ip hello-interval eigrp 1 10
r4(config-if)#
r4#sh ip eigrp int det
IP-EIGRP interfaces for process 1
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0/0 2 0/0 430 0/1 0 0
Hello interval is 10 sec
Next xmit serial <none>
Un/reliable mcasts: 0/0 Un/reliable ucasts: 1/30
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 7
Retransmissions sent: 8 Out-of-sequence rcvd: 1
Authentication mode is not set
ok so it is changed now to 10 seconds the hello
i can see on r1 the hold time is still at the default 15 seconds
switch1#sh ip eigrp nei
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
1 10.229.254.4 Po2 6 00:13:24 1 3000 0 22
0 10.229.254.2 Po2 12 00:14:20 9 200 0 14
switch1#sh ip eigrp nei
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
1 10.229.254.4 Po2 14 00:13:25 1 3000 0 22
0 10.229.254.2 Po2 11 00:14:21 9 200 0 14
it keeps starting at 14 and goes down to lowish 5-6 seconds
so the hold time is still at 15 but the hello is 10
i changed the hello on r4 to 15 seconds
we can see now on s1
switch1#sh ip eigrp ne
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
1 10.229.254.4 Po2 1 00:16:09 1 3000 0 22
0 10.229.254.2 Po2 13 00:17:05 9 200 0 14
switch1#sh ip eigrp ne
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
1 10.229.254.4 Po2 14 00:16:12 1 3000 0 22
0 10.229.254.2 Po2 14 00:17:07 9 200 0 14
switch1#sh ip eigrp ne
it keeps going very close to the dead hold time
ok on r4 i will change hold interval to
r4(config-if)#ip hold-time eigrp 1 40
switch1#sh ip eigrp neigh
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
1 10.229.254.4 Po2 37 00:01:33 1 4500 0 32
the hold time is gone high 40 seconds as i edited on r4 so the point is that changing the hold time on r4 will affect the neighboring routers not local routers.
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