目录 提要 正文 TOPO如下 基本配置如下 验证 附注

提要： 讨论EIGRP中的EIGRP Graceful Shutdown这个特性 • You want to bring B down for maintenance; the traffic will switch to C because EIGRP will reroute around B when B is taken down • The packets on the wire will be lost when B is taken off line, though—and this could be a lot of packets, if these are high speed links • It’s better to get A and D to route around C while B can still forward traffic, so it happens gracefully • To shut down routing in B, remove the EIGRP router process • EIGRP will send a goodbye message, notifying its peers that it is going down, before it cleans up the entries in the routing table • B can send a goodbye message telling A and D to reset their neighbor relationships • 12.3(2.3)B 12.3(1.4)T 12.3(1.4) or later • Old code: reset neighbor due to K value mismatch • New code: reset neighbor due to goodbye message TOPO如下： 基本配置如下： l R1 l R2 l R3 l R4 R1 interface Ethernet0/0.12 encapsulation dot1Q 12 ip address 12.1.1.1 255.255.255.0 ! interface Serial2/0 ip address 13.1.1.1 255.255.255.0 ! router eigrp 1 network 12.1.1.0 0.0.0.255 network 13.1.1.0 0.0.0.255 no auto-summary R2 interface Ethernet0/0.12 encapsulation dot1Q 12 ip address 12.1.1.2 255.255.255.0 ! interface Ethernet0/0.24 encapsulation dot1Q 24 ip address 24.1.1.2 255.255.255.0 ! ！ router eigrp 1 network 12.1.1.0 0.0.0.255 network 24.1.1.0 0.0.0.255 no auto-summary R3 interface Ethernet0/0.34 encapsulation dot1Q 34 ip address 34.1.1.3 255.255.255.0 no snmp trap link-status ! interface Serial1/0 ip address 13.1.1.3 255.255.255.0 serial restart-delay 0 ! router eigrp 1 network 13.1.1.0 0.0.0.255 network 34.1.1.0 0.0.0.255 no auto-summary R4 interface Loopback0 ip address 4.4.4.4 255.255.255.0 ! interface Ethernet0/0.24 encapsulation dot1Q 24 ip address 24.1.1.4 255.255.255.0 ! interface Ethernet0/0.34 encapsulation dot1Q 34 ip address 34.1.1.4 255.255.255.0 ! ! router eigrp 1 network 4.4.4.0 0.0.0.255 network 24.1.1.0 0.0.0.255 network 34.1.1.0 0.0.0.255 no auto-summary 验证： 测试⑴： 打开r1的debug ip eigrp，在r2上关闭eigrp进程 r1#debug ip eigrp IP-EIGRP Route Events debugging is on r1＃ *Mar 26 14:58:57.375: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 12.1.1.2 (Ethernet0/0.12) is down: Interface Goodbye received 收到goodbye消息 r1# *Mar 26 14:58:57.419: IP-EIGRP(Default-IP-Routing-Table:1): 24.1.1.0/24 - do advertise out Serial2/0 *Mar 26 14:58:57.419: IP-EIGRP(Default-IP-Routing-Table:1): Int 24.1.1.0/24 metric 4294967295 - 256000 4294967295 *Mar 26 14:58:57.475: IP-EIGRP(Default-IP-Routing-Table:1): Int 4.4.4.0/24 metric 2323456 - 1657856 665600 *Mar 26 14:58:57.475: IP-EIGRP(Default-IP-Routing-Table:1): Int 34.1.1.0/24 metric 2195456 - 1657856 537600 *Mar 26 14:58:57.475: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming UPDATE packet *Mar 26 14:58:57.475: IP-EIGRP(Default-IP-Routing-Table:1): Int 12.1.1.0/24 M 4294967295 - 1657856 4294967295 SM 4294967295 - 1657856 4294967295 r1# *Mar 26 14:58:57.547: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming REPLY packet *Mar 26 14:58:57.547: IP-EIGRP(Default-IP-Routing-Table:1): Int 24.1.1.0/24 M 2221056 - 1657856 563200 SM 307200 - 256000 51200 *Mar 26 14:58:57.583: IP-EIGRP(Default-IP-Routing-Table:1): Int 24.1.1.0/24 metric 2221056 - 1657856 563200 测试⑵：在r1上ping 4.4.4.4 2000个包，在r2上关闭eigrp进程，，看是否丢包 r2(config)#no router eigrp 1 r1#ping Protocol [ip]: Target IP address: 4.4.4.4 Repeat count [5]: 2000 Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 2000, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!! *Mar 26 14:52:50.863: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 12.1.1.2 (Ethernet0/0.12) is down: Interface Goodbye received!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 发现没有丢包，并且收到goodbye 消息 ，由此我们发现真的是完美shutdown哦

EIGRP完美关闭,嘿嘿,真的是完美