Eigrp enhanced concepts and definitions. I found the below subjects the main important notes about EIGRP routing.
feasible distance : cost betweeen routers to reach a network
advertised distance : cost for the network connected to the router
successor : first path
feasible successor : second path
On the route table :
active route : means router is trying to find a backup to route (maybe one route is down )
passive route : means everything is fine and routes are working ok
Eigrp messages :
hello : forms relationship
update : sends updates
query : asks about routes
reply : response to query
ack : acknowledhes the update , query and reply
EIGRP Metric depends on :
bandwidth , delay , reliability , loading , mtu
Using keychain for eigrp security to define rotating keys :
key chain KeychaninName
key 1
key-string keystring
accept-lifetime ?
send-lifetime ?
key 2
key-string ?
accept-lifetime ?
send-lifetime ?
int s0/0
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 KeychainName
Enhanced commands :
int s0/1
ip summary-address eigrp 1 172.16.1.0 255.255.248.0 ?
router eigrp 1
variance ? # metric multiplier , specify the load balancing (by default is one , means if one route metric is lower than the other one it will not load balance , if change it to two , then if one route metric is not less than twice of the other one it will load balance )
router eigrp 1
eigrp stub ? # to specify it has got the only way for the specific network , so there is no backup route and othr routers will not look for backup with query !
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