Olá pessoal,
Complementando meus estudos (e o de vocês) sobre a parte conceitual do EIGRP segue abaixo:
Com relação às rotas:
- Sucessor route: Rota principal para um destino. É apresentada no comando show ip route e no show ip eigrp topology como sucessor route.
- Feasible Sucessor: Possível rota alternativa para um destino. Apresentada na tabela de topologia e somente passa para a tabela de roteamento quando a sucessor route torna-se inalcançavel ou tem um custo maior que a FS.
Com relação às métricas (custo)
- Feasible Distance: Distância calculada até um destino. É composta da reported distance + o custo calculado até o destino.
- Reported Distance (Advertised Distance): Distância anunciada por um roteador vizinho até um destino. Esta métrica sempre será menor que a Feasible distance (pois se for maior está ocorrendo um loop de roteamento).
Segue abaixo a demonstração destes conceitos.
R_Matriz#sh ip eigrp topology
IP-EIGRP Topology Table for AS 10
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - Reply status
P 172.16.1.0/30, 1 successors, FD is 46226176
via Connected, Serial0/0.100
P 172.16.2.0/30, 1 successors, FD is 46226176
via Connected, Serial0/0.200
P 172.16.3.0/30, 1 successors, FD is 46226176
via Connected, Serial0/0.300
P 0.0.0.0/0, 1 successors, FD is 2169856
via Rstatic (2169856/0)
P 192.168.20.0/24, 1 successors, FD is 46228736
via 172.16.1.2 (46228736/28160), Serial0/0.100
P 192.168.30.0/24, 1 successors, FD is 46228736
via 172.16.2.2 (46228736/28160), Serial0/0.200Feasible Distance
Reported Distance
Abraçao pessoal,
Maurício.Hello staff,
Complementing my studies (and of you) on the conceptual part of the EIGRP below:
Regarding routes:
- Successor route: Route to a major destination. Is shown in the command show ip route andshow ip route EIGRP topology as successor.
- Feasible Successor: A possible alternative route to a destination. Presented in the table of topology and only goes into the routing table when a successor route becomes unreachable, or has a cost greater than the FS.
With respect to metric (cost)
- Feasible Distance: Distance calculated to a destination. It is composed of the reported distance + the calculated cost to the destination.
- Reported Distance (Distance advertised): Distance advertised by a neighbor router to a destination. This metric will always be smaller than the Feasible distance (as if more is going on a routing loop).
Here is the demonstration of these concepts.
R_Matriz # sh ip EIGRP topology
IP-EIGRP Topology Table for AS 10
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - Reply status
P 172.16.1.0/30, 1 successors, FD is 46226176
via Connected, Serial0/0.100
P 172.16.2.0/30, 1 successors, FD is 46226176
via Connected, Serial0/0.200
P 172.16.3.0/30, 1 successors, FD is 46226176
via Connected, Serial0/0.300
P 0.0.0.0/0, 1 successors, FD is 2169856
via Rstatic (2169856/0)
P 192.168.20.0/24, 1 successors, FD is 46228736
via 172.16.1.2 ( 46228736 / 28160 ), Serial0/0.100
P 192.168.30.0/24, 1 successors, FD is 46228736
via 172.16.2.2 (46228736/28160), Serial0/0.200Feasible Distance
Reported Distance
Abrasive staff,
Maurício.