- Eigrp should be configured with same eigrp process number on the neighboring routers otherwise there will be no neighborship.
- If no wild-card mask is configured on the eigrp network command, the command's single parameter should be classful network number. If wild-card mask is configured, it performs like ACL logic.
Hellos are multicast every 5 seconds, minus a small random time to prevent synchronization.
On multipoint X.25, Frame Relay, and ATM interfaces, with
access link speeds of T1 or slower, Hellos are unicast every 60 seconds.
The hold time tells the router the maximum time it should wait to receive subsequent Hellos. If the hold timer expires before a Hello is received, the neighbor is declared unreachable and DUAL is informed of the loss of a neighbor. By default, the hold time is three times the Hello interval—180 seconds for low-speed non-broadcast multi-access (NBMA) networks and 15 seconds for all other networks. The default can be changed on a per interface basis with the command ip hold-time eigrp.
Full updates occur when neighbors first come up. After that, the neighbors send only partial updates in reaction to changes to a route.
The hold time tells the router the maximum time it should wait to receive subsequent Hellos. If the hold timer expires before a Hello is received, the neighbor is declared unreachable and DUAL is informed of the loss of a neighbor. By default, the hold time is three times the Hello interval—180 seconds for low-speed non-broadcast multi-access (NBMA) networks and 15 seconds for all other networks. The default can be changed on a per interface basis with the command ip hold-time eigrp.
Full updates occur when neighbors first come up. After that, the neighbors send only partial updates in reaction to changes to a route.
Reliable Transport Protocol
In this formula, the term least-bandwidth represents the lowest-bandwidth link in the route, using a unit of kilobits per second
EIGRP hello and hold timer configurations :
these settings are made on interfaces only not per neighbor. where 9 is asn
Passive interface
router eigrp 1
passive-interface default
Two commands help to verify that the passive interface design is working properly.
First, the show ip eigrp interfaces command omits passive interfaces, listing the non-passive interfaces matched by a network command. Alternatively, the show ip protocols command explicitly lists all passive interfaces.
EIGRP Authentication
Step1
- Create a chain and give it a name
router(config)#key chain cisco
router(config-keychain)#
the name does not need to match on neighboring routers.
- Create one or more key number using the key number command in key configuration mode.
router(config-keychain)#key 1
router(config-keychain-key)# (key number should be same)define key's value using key-string value command in key configuration mode.
router(config-keychain-key)#key-string book
step2. Enable Eigrp MD5 authentiocation on an interface
config)#int f0/0
config-if)#ip authentication mode eigrp asn md5
config-if)#ip authentiation key-chain eigrp asn name of the chain
Important :-
# to check the delay, bandwidth MTU, etc
show interfaces
# to check the K-values
Show ip protocols
Commands for EIGRPv4
sh ip protocols
sh ip eigrp interfaces
sh ip eigrp neighbors
sh ip eigrp topology
sh ip route
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