The show ip eigrp topology Command

This command shows the topology table. It allows for the analysis of DUAL. It will show whether the successor or the route is in an active or passive state. The syntax is as follows:

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

Example 7-3 shows the output of this command.

Example 7-3 show ip eigrp topology Output

Router# show ip eigrp topology

IP-EIGRP Topology Table for process 100

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

P 140.100.56.0 255.255.255.0, 2 successors, FD is 0

via 140.100.32.22 (46251776/46226176), Ethernet0

via 140.100.48.22 (46251776/46226176), Ethernet1

via 140.100.32.31 (46277376/46251776), Ethernet0

P 140.100.48.0 255.255.255.0, 1 successors, FD is 307200

via Connected, Ethernet1

via 140.100.48.22 (307200/281600), Ethernet1 140.100.32.22 (307200/281600), Ethernet0 via 140.100.32.31 (332800/307200), Ethernet0

Table 7-6 explains the meaning of the important fields in Example 7-3. Table 7-6 Explanation of the show ip eigrp topology Command Results

Field

Explanation

P

Passive—The router has not received any EIGRP input from a neighbor, and

the network is assumed to be stable.

A

Active—When a route or successor is down, the router attempts to find an

alternative path. After local computation, the router realizes that it must query

the neighbor to see whether it can find a feasible successor or path.

U

Update—A value in this field identifies that the router has sent an update

packet to a neighbor.

Q

Query—A value in this field identifies that the router has sent a query packet

to a neighbor.

R

Reply—A value here shows that the router has sent a reply to the neighbor.

r

This is used in conjunction with the query counter; the router has sent out a

query and is awaiting a reply.

140.100.48.0

This is the destination IP network number.

255.255.255.0

This is the destination subnet mask.

Successors

These are the number of routes or the next logical hop. The number stated

here is the same as the number of routes in the routing table.

FD

Feasible distance—This is the metric or cost to the destination from the

router.

Replies

These are the number of replies that the router is still waiting for from this

neighbor. This is relevant only when the route is in an active state.

State

This is the EIGRP state of the route. It can be the number 0, 1, 2, or 3. This is

relevant when the destination is active.

Via

This is the address of the next logical hop, or the neighbor that told the router

about this route. The first N of these entries 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 feasible distance, or

the cost to the destination. The number after the slash is the EIGRP metric

that the peer advertised, or the advertised distance.

Ethernet0

This is the interface through which the EIGRP packets were received and,

therefore, the outgoing interface.

0 -1

Responses

  • oona
    What means passive in output of show IP eigrp topology?
    4 months ago

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