qr code c# tutorial 21: EIGRP Routing in Objective-C

Generating QR in Objective-C 21: EIGRP Routing

21: EIGRP Routing
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reply (R where a reply packet was sent to a destination), and reply status (r where the router sent a query and is waiting for a reply)
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The topology table displays all routes/paths to each destination Be able to pick out successor
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and feasible successor routes from the output of the show ip eigrp topology command
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The show ip eigrp interfaces Command
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To see information about the interfaces on which EIGRP is enabled, use the following command:
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Router# show ip eigrp interfaces IP EIGRP interfaces for process 100 Xmit Queue Mean Pacing Time Multicast Pending Int Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes Et0/0 1 0/0 337 0/10 0 0 Se1/0 1 0/0 10 1/63 103 0
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Optionally, you can qualify the output by specifying an interface after the interfaces parameter Table 21-4 explains the information found in the
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TABLE 21-4
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Fields from the show ip eigrp interfaces Command
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Field
Int Peers Xmit Queue Un/Reliable Mean SRTT Pacing Time Un/Reliable Multicast Flow Timer Pending Routes
Description
Interface on which the EIGRP process is enabled Number of EIGRP peers in the AS seen off of the associated interface Number of EIGRP packets remaining queued up in the Unreliable and Reliable queues Average smooth round-trip time (SRTT) time in milliseconds between all neighbors off of the interface Number of milliseconds the router waits after transmitting Unreliable and Reliable EIGRP packets Number of milliseconds to wait for an acknowledgment of a sent EIGRP multicast packet before transmitting another multicast packet Number of EIGRP routes in packets waiting to be sent from the transmit queue on the specified interface
EIGRP Troubleshooting
preceding output In this example, EIGRP is enabled for Ethernet0/0 and Serial1/0 in AS 100 and one EIGRP peer is off of each interface
The show ip eigrp traf c Command
To see information about traffic statistics for EIGRP, use the following command:
Router# show ip eigrp traffic IP-EIGRP Traffic Statistics for process 200 Hellos sent/received: 274/139 Updates sent/received: 3/4 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
As you can see from this output, the router is sending and receiving hellos and updates and is sharing information with neighboring EIGRP routers
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2106 The CD contains a multimedia demonstration of the show ip eigrp traffic command for EIGRP on a router
The debug ip eigrp Command
To troubleshoot EIGRP routing problems, you can use debug commands The following command displays EIGRP events (other parameters are available for this command):
Router# debug ip eigrp IP-EIGRP: 10040/24 - don't advertise out Serial0 IP-EIGRP: 19216840/24 - do advertise out Serial0 IP-EIGRP: 10000/8 - do advertise out Serial0 IP-EIGRP: Int 10000/8 metric 28160 - 25600 2560 IP-EIGRP: Processing incoming UPDATE packet IP-EIGRP: Int 1921681000/24 M 2195456 - 1657856 537600 SM 281600 - 56000 25600 IP-EIGRP: 1921681000/24 routing table not updated IP-EIGRP: 10040/24 - don't advertise out Serial0 IP-EIGRP: 19216840/24 - do advertise out Serial0 IP-EIGRP: 10000/8 - do advertise out Serial0 IP-EIGRP: Int 10000/8 metric 28160 - 25600 2560 IP-EIGRP: Processing incoming UPDATE packet IP-EIGRP: Int 10000/8 M 4294967295 - 1657856 4294967295 SM 4294967295 - 1657856 4294967295
21: EIGRP Routing
In this example, I disabled and re-enabled Serial0 As you can see, it is advertising 19216840 to its neighbor connected to this interface
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The debug eigrp packets Command
If you see an EIGRP neighbor as a peer and/or see EIGRP routing updates from the peer in the routing table, the two peers are using matching keys for authentication If you don t see a router as a neighbor (show ip eigrp neighbors) when you expect to see a peer as a neighbor, this could indicate an authentication problem When using the debug eigrp packets command and you see authentication mismatch and dropping peer, invalid authentication messages, then the two peers have an authentication configuration problem:
Router# debug eigrp packets EIGRP Packets debugging is on (UPDATE, REQUEST, QUERY, REPLY, HELLO, IPXSAP, PROBE, ACK, STUB, SIAQUERY, SIAREPLY) EIGRP: pkt key id = 2, authentication mismatch EIGRP: Serial0/1: ignored packet from 19216812, opcode = 5 (invalid authentication) EIGRP: Dropping peer, invalid authentication EIGRP: Sending HELLO on Serial0/1 AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 19216812 (Serial0/1) is down: Auth failure
Make sure the lifetime values match between peer routers so that when changing from one key to another, the right key value is used to authenticate the routing updates successfully this is a common misconfiguration that causes authentication to fail If you see a Mismatched adjacency values or K-Value mismatch message in the preceding debug command output, it could be caused by a mismatch in the AS number or a mismatch in the K-values enabled on the two EIGRP routers
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