IPX EIGRP


In a total Cisco routed environment, a better choice than IPX RIP is Cisco's Enhanced Interior Gateway Routing Protocol ( EIGRP ) . IPX EIGRP is a routing protocol for a growing network.

IPX EIGRP is better for a number of reasons. First, it scales better in larger networks. The protocol has a 224-hop count limitation as opposed to the 15-hop limit for IPX RIP. The convergence time is also much faster, so routers learn of problems in the network much faster than with IPX RIP. Updates between routers are only sent out when they are needed, which saves a considerable amount of bandwidth.

Configuring EIGRP

To configure IPX EIGRP, you must use the ipx router eigrp command and identify both an autonomous system number and the network numbers in the network. You must have IPX routing enabled, and all the interfaces must be configured with an IPX network number and encapsulation type. The following shows an example of configuring IPX EIGRP:

 DCS2514# config terminal DCS2514(config)# ipx router eigrp 10 DCS2514(config-ipx-router)# network 100 DCS2514(config-ipx-router)# network 200 DCS2514(config-ipx-router)#  network 300  

Troubleshooting IPX EIGRP

There are several commands that you should know for troubleshooting IPX EIGRP problems and configurations. show ipx eigrp is one of the main commands used to help troubleshoot problems with EIGRP. The following are the available syntaxes for the command:

 DCS12514#  show ipx eigrp ?  interfaces IPX EIGRP Interfaces  neighbors  IPX EIGRP Neighbors  topology   IPX EIGRP Topology Table  traffic    IPX EIGRP Traffic Statistics 

The above output shows the syntaxes available for the command. The interfaces syntax displays all the interfaces using IPX EIGRP. The neighbors syntax displays all the one hop away devices running the IPX EIGRP protocol. The topology syntax displays the known networks and routes learned with the IPX EIGRP protocol. The traffic syntax displays the current statistic counters relating to the IPX EIGRP protocols.

To successfully troubleshoot IPX EIGRP, you also need to have a good understanding of the commands that will allow you to see the known routes through the network, and whether the routing table is updating correctly. The show ipx eigrp neighbors , show ipx eigrp topology , and show ipx route commands are used to troubleshoot these. The following sections take a look at these commands in detail.

show ipx eigrp neighbors

The show ipx eigrp neighbors command displays information that can be used to find the directly connected neighbors or to identify routes that are going up and down, which can be identified by an increase in the sequence numbers on an interface.

The following output shows the first EIGRP neighbor the router learned about a little more than 22 hours ago on the Ethernet1 interface. Since learning the route, 2,614 updates have been received on that interface. The Smooth Round TripTime (SRTT) is set to 15 seconds and the Retransmission TimeOut (RTO) is set to 30 seconds.

 DCS2514#  show ipx eigrp neighbors  IPX EIGRP Neighbors for process 10 H  Address            Interface   Hold   Uptime    Q   Seq  SRTT  RTO 1  100.0000.604a.3d7d Ethernet1   12     06:12:43  0   2614 15    30 0  300.0000.604a.5a4b Ethernet0   12     06:12:46  0   2617 15    30 
show ipx eigrp topology

The following output from the use of the show ipx eigrp topology command shows that for IPX EIGRP process 10, networks 100, 200, and 300 are connected to the Ethernet 0 interface on the router:

 DCS2514#  show ipx eigrp topology  Topology Table for process 10 Codes: P-Passive, A-Active, U-Update, Q-Query, R-Reply, r-Reply status P 100, 1 successors, FD is 225488      via 300.0000.604a.5a4b (225488/274200), Ethernet0 P 200, 1 successors, FD is 265486      via 300.0000.604a.5a4b (265486/302430), Ethernet0 P 300, 1 successors, FD is 211852      via Connected, Ethernet0 
show ipx route

The following output from the show ipx route command provides information on static and IPX routing protocols, including RIP, EIGRP, and NLSP discovered routes:

 DCS2514# show ipx routes Codes: C - Connected primary network, c - Connected secondary network, S - Static, F - Floating static, L - Local (internal), W - IPXWAN, R  RIP , E - EIGRP, N - NLSP, X - External, A  Aggregate, s - seconds,  u - uses 4 Total IPX routes. Up to 1 parallel paths and 16 hops allowed. No default route known. L 400 is the internal network C 300 (NOVELL-ETHER), Ethernet0 C 200 (NOVELL-ETHER), Ethernet1 E 100 [284228/0] via 300.0000.604a.5a4b, age 2w5d, 1u, E0 

The preceding output shows that network 400 is the internal network, Ethernet 0 is directly attached to network 300, Ethernet 1 is attached to network 200, and network 100 can be reached through the same interface as network 300 by using the Ethernet 0 interface.



CCNP CIT Exam Cram 2 (642-831)
CCNP CIT Exam Cram 2 (Exam Cram 642-831)
ISBN: 0789730219
EAN: 2147483647
Year: 2003
Pages: 213
Authors: Sean Odom

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