---
title: A Case Study on EIGRP Graceful Shutdown
description: What  is a graceful shutdown what do the contents of an EIGRP packet look  like when the message is sent and what does the receiving router do  with
---

[Network Simulation & IT Training | Boson Blog ](https://blog.boson.com)

# [A Case Study on EIGRP Graceful Shutdown](https://blog.boson.com/bid/53303/a-case-study-on-eigrp-graceful-shutdown)

 Written by [Kelson Lawrence](https://blog.boson.com/author/kelson-lawrence) | Feb 8, 2011 4:25:00 PM

By Andrew Messier

 The topology for this study consists of two routers connected on a LAN. FastEthernet 0/0 on Router1 connects to FastEthernet 0/0 on Router2. Full connectivity exists between both routers, and Enhanced Interior Gateway Routing Protocol (EIGRP) using Autonomous System (AS) 100 is configured to run on both FastEthernet ports. Below is sample configuration for this setup:

Router1#show running-config   
hostname Router1   
interface FastEthernet0/0    
 ip address 10.0.0.1 255.255.255.0   
router eigrp 100    
 network 10.0.0.0

Router2#show running-config   
hostname Router2   
interface FastEthernet0/0    
 ip address 10.0.0.2 255.255.255.0   
router eigrp 100    
 network 10.0.0.0

What is a graceful shutdown, what do the contents of an EIGRP packet look like when the message is sent, and what does the receiving router do with the message?

A graceful shutdown is a router’s way of telling its neighbor to end the adjacency with the router because the EIGRP routing process is disabled. The change converges more quickly than allowing each device to reach its hold interval, which is by default fifteen seconds on fast links. A graceful shutdown is a goodbye message sent out of each interface running EIGRP. The goodbye message is a form of a Hello message, but with all five K-values set to 255. Below is sample capture after removing EIGRP from interface FastEthernet 0/0 on Router1:

Frame 162 (74 bytes on wire, 74 bytes captured)

Ethernet II, Src: cc:00:15:7c:00:00 (cc:00:15:7c:00:00), Dst: IPv4mcast_00:00:0a (01:00:5e:00:00:0a)

Internet Protocol, Src: 10.0.0.1 (10.0.0.1), Dst: 224.0.0.10 (224.0.0.10)

Cisco EIGRP

    Version = 2

    Opcode = 5 (Hello)

    Checksum = 0xf168

    Flags = 0x00000000

    Sequence = 0

    Acknowledge = 0

    Autonomous System : 100

    EIGRP Parameters

        Type = 0x0001 (EIGRP Parameters)

        Size = 12 bytes

        K1 = 255

        K2 = 255

        K3 = 255

        K4 = 255

        K5 = 255

        Reserved

        Hold Time = 15

    Software Version: IOS = 12.3, EIGRP = 1.2

        Type = 0x0004 (Software Version)

        Size = 8 bytes

        IOS release version = 12.3

        EIGRP release version = 1.2

 

When the command **eigrp log-neighbor-changes** in EIGRP-configuration mode is enabled, routers that had adjacencies with the router sending the graceful shutdown may print out one of two things depending on what Cisco IOS Release is running. Cisco IOS did not support the goodbye message until release 12.3, so devices using older IOS will display that a K-Value mismatch was found, and devices since the update will display the receipt of the goodbye message. In either case, the device receiving the message will disable the EIGRP adjacency established with the sending neighbor on that interface.

 

 

[View full post](https://blog.boson.com/bid/53303/a-case-study-on-eigrp-graceful-shutdown)

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