Verifying EIGRP show ip protocols

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R1#show ip protocols

Routing Protocol is "eigrp 100"

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

Default networks flagged in outgoing updates

Default networks accepted from incoming updates

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Redistributing: eigrp 100

EIGRP NSF-aware route hold timer is 240s <output omitted>

Maximum path: 4

Routing for Networks: 172.16.1.0/24 192.168.1.0 Routing Information Sources: Gateway Distance

(this router) 90

Gateway Distance

192.168.1.102 90

Distance: internal 90 external

Last Update 00:09:38 Last Update 00:09:40 17 0

The show ip protocols command gives information about any and all dynamic routing protocols running on the router.

As shown in the partial output in the figure, when EIGRP is running, the show ip protocols command output displays any routing filtering occurring on EIGRP outbound or inbound updates. It also identifies whether EIGRP is generating a default network or receiving a default network in EIGRP updates.

The full output of this command is as follows: R1#show ip protocols

Routing Protocol is "eigrp 100"

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

Default networks flagged in outgoing updates

Default networks accepted from incoming updates

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Redistributing: eigrp 100

© 2006 Cisco Systems, Inc. Configuring EIGRP 2-37

EIGRP NSF-aware route hold timer is 240s Automatic network summarization is in effect Automatic address summarization: 192.168.1.0/24 for FastEthernet0/0 Summarizing with metric 40512000 172.16.0.0/16 for Serial0/0/1 Summarizing with metric 28160 Maximum path: 4 Routing for Networks: 172.16.1.0/24 192.168.1.0 Routing Information Sources:

Gateway Distance Last Update

(this router) 90 00:09:38

Gateway Distance Last Update

192.168.1.102 90 00:09:40

Distance: internal 90 external 170

The command output provides information about additional default settings for EIGRP, such as default K values, hop count, and variance.

Note Because the routers must have identical K values for EIGRP to establish an adjacency, the show ip protocols command helps to determine the current K value setting before an adjacency is attempted.

This sample output also indicates that automatic summarization is enabled (this is the default) and that the router is allowed to load-balance over a maximum of four paths. (Cisco IOS software allows configuration of up to six paths for equal-cost load balancing, using the maximum-path command.)

The networks for which the router is routing are also displayed. As shown in the figure, the format of the output varies, depending on the use of the wildcard mask in the network command. If a wildcard mask is used, the network address is displayed with a prefix length. If a wildcard mask is not used, the Class A, B, or C major network is displayed.

The routing information sources portion of this command output identifies all other routers that have an EIGRP neighbor relationship with this router. The show ip eigrp neighbors command provides a detailed display of EIGRP neighbors.

The show ip protocols command output also provides the two administrative distances. First, an administrative distance of 90 applies to networks from other routers inside the AS; these are considered internal networks. Second, an administrative distance of 170 applies to networks introduced to EIGRP for this AS through redistribution; these are called external networks.

2-38 Building Scalable Cisco Internetworks (BSCI) v3.0 © 2006 Cisco Systems, Inc.

R1#show ip eigrp interfaces

IP-EIGRP interfaces for

process 100

Xmit Queue

Mean

Pacing Time

Multicast

Pending

Interface Peers

Un/Reliable

SRTT

Un/Reliable

Flow Timer

Routes

Fa0/0 0

0/0

0

0/10

0

0

Se0/0/1 1

0/0

10

10/380

424

0

The show ip eigrp interfaces command displays information about interfaces configured for

EIGRP. This output includes the following key elements:

■ Interface: Interface over which EIGRP is configured

■ Peers: Number of directly connected EIGRP neighbors

■ Xmit Queue Un/Reliable: Number of packets remaining in the Unreliable and Reliable transmit queues

■ Mean SRTT: Mean SRTT interval, in milliseconds

■ Pacing Time Un/Reliable: Pacing time used to determine when EIGRP packets should be sent out the interface (unreliable and reliable packets)

■ Multicast Flow Timer: Maximum number of seconds in which the router will send multicast EIGRP packets

■ Pending Routes: Number of routes in the packets in the transmit queue waiting to be sent

© 2006 Cisco Systems, Inc. Configuring EIGRP 2-39

R1#show ip eigrp topology

IP-EIGRP Topology Table for AS(100)/ID(192.168.1.101) Codes: P - Passive, A - Active, U - Update, Q - Query, R -Reply, r - reply Status, s - sia Status P 192.168.1.96/27, 1 successors, FD is 40512000

via Connected, Serial0/0/1 P 192.168.1.0/24, 1 successors, FD is 40512000

via Summary (40512000/0), Null0 P 172.16.0.0/16, 1 successors, FD is 28160

via Summary (28160/0), Null0 P 172.16.1.0/24, 1 successors, FD is 28160

via Connected, FastEthernet0/0 P 172.17.0.0/16, 1 successors, FD is 40514560

via 192.168.1.102 (40514560/28160), Serial0/0/1

Another command used to verify EIGRP operations is the show ip eigrp topology command. For example, the figure illustrates that router R1 has an ID of 192.168.1.101 and is in AS 100— the EIGRP ID is the highest IP address on an active interface for this router.

As shown in the figure, this command output lists the networks known by this router through the EIGRP routing process. The codes in the command output are as follows:

■ Passive (P): This network is available, and installation can occur in the routing table. Passive is the correct state for a stable network.

■ Active (A): This network is currently unavailable, and installation cannot occur in the routing table. Being active means that there are outstanding queries for this network.

■ Update (U): This code applies if a network is being updated (placed in an update packet). This code also applies if the router is waiting for an acknowledgment for this update packet.

■ Query (Q): This code applies if there is an outstanding query packet for this network other than being in the active state. This code also applies if the router is waiting for an acknowledgment for a query packet.

■ Reply (R) status: This code applies if the router is generating a reply for this network or is waiting for an acknowledgment for the reply packet.

■ Stuck-in-active (SIA) status: This code signifies an EIGRP convergence problem for the network with which it is associated.

The number of successors available for a route is indicated in the command output. In this example, all networks have one successor. If there were equal-cost paths to the same network, a maximum of six paths would be shown. The number of successors corresponds to the number of best routes with equal cost.

2-40 Building Scalable Cisco Internetworks (BSCI) v3.0 © 2006 Cisco Systems, Inc.

For each network, the FD is displayed, followed by the next-hop address, which is followed by a field similar to (40514560/28160) in the figure. The first number in this field is the FD for that network through this next-hop router, and the second number is the advertised distance (AD) from the next-hop router to the destination network.

© 2006 Cisco Systems, Inc. Configuring EIGRP 2-41

R1#show ip eigrp traffic

IP-EIGRP Traffic Statistics for AS

100

Hellos sent/received: 429/192

Updates sent/received: 4/4

Queries sent/received: 1/0

Replies sent/received: 0/1

Acks sent/received: 4/3

Input queue high water mark 1, 0

drops

SIA-Queries sent/received: 0/0

SIA-Replies sent/received: 0/0

Hello Process ID: 113

PDM Process ID: 73

To display the number of various EIGRP packets sent and received, use the show ip eigrp traffic command, as illustrated in the figure. For example, in this network, router R1 has sent 429 hello messages and received 192 hello messages.

2-42 Building Scalable Cisco Internetworks (BSCI) v3.0 © 2006 Cisco Systems, Inc.

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Responses

  • gundolpho
    What is the eigrp nsfaware route hold timer?
    2 years ago
  • NEBAY
    What is the use of show ip protocols?
    4 months ago

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