Enrutamiento EIGRP métricas Neighbor Table
Información acerca EIGRP
Que son las métricas
Las métricas son valores que se dan a las rutas para poder saber cual es el mejor camino para llegar a un destino.
Las métricas en EIGRP se basan en la siguiente fórmula
Las constantes son valores que deben ser iguale en todos los routers que participan en este enlace.
CISCO prefiere esta representación de la fórmula y sus constantes
Neighbor Table
Esta tabla nos informa de los routers vecinos, o sea, la tabla que muestra los routers que están en el mismo AS y se interconectan mediante los Hellos
R1#sh ip eigrp neighbors EIGRP-IPv4 Neighbors for AS(10) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 192.168.1.2 Fa3/1 13 01:28:31 43 258 0 10 0 192.168.2.2 Fa2/0 12 02:21:03 108 648 0 13 R1# R2#sh ip eigrp neighbors EIGRP-IPv4 Neighbors for AS(10) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 192.168.3.2 Fa3/0 13 00:02:15 56 336 0 11 0 192.168.2.1 Fa2/0 11 02:20:17 951 5000 0 18 EIGRP-IPv4 Neighbors for AS(20) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 172.168.10.2 Fa3/1 11 00:11:17 1 3000 0 1 R2# R3#sh ip eigrp neighbors EIGRP-IPv4 Neighbors for AS(10) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 192.168.3.1 Fa3/0 10 00:02:31 99 594 0 14 0 192.168.1.1 Fa3/1 14 01:28:04 52 312 0 19 EIGRP-IPv4 Neighbors for AS(30) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 172.168.20.2 Fa0/0 10 00:06:43 1 3000 0 1 R3#
topology table
La tabla de topología muestra las rutas, las métricas y las interfaces.
Parece que el hecho que las interfaces esten en modo Passive, es una buena señal.
Los valores 30720/28160 son “the feasible distance” para 30720 y “the advertised distance” para 28160.
the feasible distance es la distancia desde tu red al destino.
the advertised distance es la distncia desde tu equipo hasta el destino.
R1#sh ip eigrp topology EIGRP-IPv4 Topology Table for AS(10)/ID(10.10.20.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 192.168.3.0/24, 2 successors, FD is 30720 via 192.168.1.2 (30720/28160), FastEthernet3/1 via 192.168.2.2 (30720/28160), FastEthernet2/0 P 192.168.2.0/24, 1 successors, FD is 28160 via Connected, FastEthernet2/0 P 10.20.20.0/24, 1 successors, FD is 156160 via 192.168.2.2 (156160/128256), FastEthernet2/0 P 192.168.1.0/24, 1 successors, FD is 28160 via Connected, FastEthernet3/1 P 10.20.10.0/24, 1 successors, FD is 156160 via 192.168.2.2 (156160/128256), FastEthernet2/0 P 10.30.20.0/24, 1 successors, FD is 156160 via 192.168.1.2 (156160/128256), FastEthernet3/1 P 10.10.20.0/24, 1 successors, FD is 128256 via Connected, Loopback2 P 10.30.10.0/24, 1 successors, FD is 156160 via 192.168.1.2 (156160/128256), FastEthernet3/1 P 10.10.10.0/24, 1 successors, FD is 128256 via Connected, Loopback1 R2#sh ip eigrp topology EIGRP-IPv4 Topology Table for AS(10)/ID(10.20.20.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 192.168.3.0/24, 1 successors, FD is 28160 via Connected, FastEthernet3/0 P 192.168.2.0/24, 1 successors, FD is 28160 via Connected, FastEthernet2/0 P 10.20.20.0/24, 1 successors, FD is 128256 via Connected, Loopback2 P 192.168.1.0/24, 2 successors, FD is 30720 via 192.168.2.1 (30720/28160), FastEthernet2/0 via 192.168.3.2 (30720/28160), FastEthernet3/0 P 10.20.10.0/24, 1 successors, FD is 128256 via Connected, Loopback1 P 10.30.20.0/24, 1 successors, FD is 156160 via 192.168.3.2 (156160/128256), FastEthernet3/0 P 10.10.20.0/24, 1 successors, FD is 156160 via 192.168.2.1 (156160/128256), FastEthernet2/0 P 10.30.10.0/24, 1 successors, FD is 156160 via 192.168.3.2 (156160/128256), FastEthernet3/0 P 10.10.10.0/24, 1 successors, FD is 156160 via 192.168.2.1 (156160/128256), FastEthernet2/0 EIGRP-IPv4 Topology Table for AS(20)/ID(10.20.20.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 172.168.10.0/24, 1 successors, FD is 28160 via Connected, FastEthernet3/1 R3#sh ip eigrp topology EIGRP-IPv4 Topology Table for AS(10)/ID(10.30.20.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 192.168.3.0/24, 1 successors, FD is 28160 via Connected, FastEthernet3/0 P 192.168.2.0/24, 2 successors, FD is 30720 via 192.168.1.1 (30720/28160), FastEthernet3/1 via 192.168.3.1 (30720/28160), FastEthernet3/0 P 10.20.20.0/24, 1 successors, FD is 156160 via 192.168.3.1 (156160/128256), FastEthernet3/0 P 192.168.1.0/24, 1 successors, FD is 28160 via Connected, FastEthernet3/1 P 10.20.10.0/24, 1 successors, FD is 156160 via 192.168.3.1 (156160/128256), FastEthernet3/0 P 10.30.20.0/24, 1 successors, FD is 128256 via Connected, Loopback2 P 10.10.20.0/24, 1 successors, FD is 156160 via 192.168.1.1 (156160/128256), FastEthernet3/1 P 10.30.10.0/24, 1 successors, FD is 128256 via Connected, Loopback1 P 10.10.10.0/24, 1 successors, FD is 156160 via 192.168.1.1 (156160/128256), FastEthernet3/1 EIGRP-IPv4 Topology Table for AS(30)/ID(10.30.20.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 172.168.20.0/24, 1 successors, FD is 28160 via Connected, FastEthernet0/0
Routing Table
Fuente métricas y imágenes: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-sy/ire-15-sy-book/ire-wid-met.html
Imágen formula y constantes todo junto EIGRP: http://routeleak.com/wp-content/uploads/2015/06/EIGRP-Composite-Metric-Formula.jpg
Info de EIGRP en interfaces modo passive: https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13675-16.html
AUTOR: David Perez Martorell davidperezmartorell@gmail.com
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