Command:

show ip eigrp topology

Mode:

Router#


Syntax:

show ip eigrp topology [ autonomous-system-number| [[ ip-address] mask]]

Syntax Description:

number

(Optional) Autonomous system number.

ip-address

(Optional) IP address. When specified with a mask, a detailed description of the entry is provided.

mask

(Optional) Subnet mask.

active

(Optional) Displays only active entries in the EIGRP topology table.

all-links

(Optional) Displays all entries in the EIGRP topology table.

pending

(Optional) Displays all entries in the EIGRP topology table that are waiting for an update from a neighbor or are waiting to reply to a neighbor.

summary

(Optional) Displays a summary of the EIGRP topology table.

zero-successors

(Optional) Displays available routes in the EIGRP topology table.

 

Command Description:

To display the EIGRP topology table, use the show ip eigrp topologyEXEC command. This command is also used to determine Diffusing Update Algorithm (DUAL) states and to debug possible DUAL problems.


Example:

 


Router#
show ip eigrp topology

IP-EIGRP Topology Table for process 77

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,

r - Reply status

P 172.16.90.0 255.255.255.0, 2 successors, FD is 0

via 172.16.80.28 (46251776/46226176), Ethernet0

via 172.16.81.28 (46251776/46226176), Ethernet1

via 172.16.80.31 (46277376/46251776), Serial0

P 172.16.81.0 255.255.255.0, 1 successors, FD is 307200

via Connected, Ethernet1

via 172.16.81.28 (307200/281600), Ethernet1

via 172.16.80.28 (307200/281600), Ethernet0

via 172.16.80.31 (332800/307200), Serial0

Table 61describes the significant fields shown in the display.

Table 61   show ip eigrp topology Field Descriptions

Field

Description

Codes

State of this topology table entry. Passive and Active refer to the EIGRP state with respect to this destination; Update, Query, and Reply refer to the type of packet that is being sent.

P - Passive

No EIGRP computations are being performed for this destination.

A - Active

EIGRP computations are being performed for this destination.

U - Update

Indicates that an update packet was sent to this destination.

Q - Query

Indicates that a query packet was sent to this destination.

R - Reply

Indicates that a reply packet was sent to this destination.

r - Reply status

Flag that is set after the software has sent a query and is waiting for a reply.

172.16.90.0

Destination IP network number.

255.255.255.0

Destination subnet mask.

successors

Number of successors. This number corresponds to the number of next hops in the IP routing table. If "successors" is capitalized, then the route or next hop is in a transition state.

FD

Feasible distance. The feasible distance is the best metric to reach the destination or the best metric that was known when the route went active. This value is used in the feasibility condition check. If the reported distance of the router (the metric after the slash) is less than the feasible distance, the feasibility condition is met and that path is a feasible successor. Once the software determines it has a feasible successor, it need not send a query for that destination.

replies

Number of replies that are still outstanding (have not been received) with respect to this destination. This information appears only when the destination is in Active state.

state

Exact EIGRP state that this destination is in. It can be the number 0, 1, 2, or 3. This information appears only when the destination is in the Active state.

via

IP address of the peer that told the software about this destination. The first nof these entries, where N is the number of successors, are the current successors. The remaining entries on the list are feasible successors.

(46251776/46226176)

The first number is the EIGRP metric that represents the cost to the destination. The second number is the EIGRP metric that this peer advertised.

Ethernet0

Interface from which this information was learned.

Serial0

Interface from which this information was learned.


 


Misconceptions:

 

None


Related commands:

 

show ip eigrp


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