Wednesday, March 23, 2011

Lab 61 - EIGRP Timers

Prerequisites: CCNP level skills.

Topology

Pic. 1 - Topology Diagram.
Icons designed by: Andrzej Szoblik - http://www.newo.pl

Task1
Configure R1 to send hello towards R3 every 2 seconds on S0/1 interface. THe hold interval should be 3 times the hello timer. Do not change timers on R3.

Task 2
Configure EIGRP so that the routers should respond to EIGRP Query packet within 60 seconds before the neighbor is declared SIA.

Task 3
Configure EIGRP so that the routers will hold known routes for NFS-capable neighbor for 2 minutes during switch-over operation.

Lab Solution

Task1
Configure R1 to send hello towards R3 every 2 seconds on S0/1 interface. THe hold interval should be 3 times the hello timer. Do not change timers on R3.

R1 Configuration:
!
interface Serial0/1
 ip address 10.1.13.1 255.255.255.0
 ip hello-interval eigrp 1 2
 ip hold-time eigrp 1 6
!

Note!
In EIGRP the hello and hold interval do not have to match between neighbors (for consistency sake they should be set identically though).

Task 2
Configure EIGRP so that the routers should respond to EIGRP Query packet within 60 seconds before the neighbor is declared SIA.

On All Routers:
!
router eigrp 1
  timers active-time 1
!

Task 3
Configure EIGRP so that the routers will hold known routes for NFS-capable neighbor for 2 minutes during switch-over operation.
On All Routers:

!
router eigrp 1
  timers nsf route-hold 120
!

Verification:
Pic 2 - NFS Route-Hold Timer.
Notice!
NFS route-hold timer ranges from 20-300 seconds. The default is 240 sec. and can be displayed using 'show ip protocols' command.