EIGRP密文验证及密码过渡

 

实验是基于dynagen & dynamips 做的。

红色为KEY的配置步骤,绿色为转换的过程(密码过渡时因两台路由器没用时间服务器同步时间不同,在过程中出现了验证失败。)

TOP:

    R1(s1/0)-------------(s1/0)R2
R1:
loopback 192.168.10.1/24
s1/0     192.168.20.1/30

R2:
loopback 192.168.30.1/24
s1/0     192.168.20.2/30


----------------------R1-----------------
Router>enable
Router#conf t
Router(config)#hostname R1
R1(config)#enable secret cisco
R1(config)#line console 0
R1(config-line)#exec-timeout 30 0
R1(config-line)#logging synchronous
R1(config-line)#exit
R1(config)#interface s1/0
R1(config-if)#ip address 192.168.20.1 255.255.255.252
R1(config-if)#no shutdown
R1(config-if)#interface loopback 0
R1(config-if)#ip address 192.168.10.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#router eigrp 100
R1(config-router)#no auto-summary
R1(config-router)#network 192.168.20.0 0.0.0.3
R1(config-router)#network 192.168.10.0 0.0.0.255

R1(config)#do show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
D    192.168.30.0/24 [90/2297856] via 192.168.20.2, 00:07:04, Serial1/0
C    192.168.10.0/24 is directly connected, Loopback0
     192.168.20.0/30 is subnetted, 1 subnets
C       192.168.20.0 is directly connected, Serial1/0

R1(config)#key chain charhai
R1(config-keychain)#key 1
R1(config-keychain-key)#key-st
R1(config-keychain-key)#key-string cisco12
R1(config-keychain-key)#exit
R1(config-keychain)#exit
R1(config)#interface s1/0
R1(config-if)#ip authentication mode eigrp 100 md5
R1(config-if)#
*Mar  1 00:41:10.599: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.20.2
(Serial1/0) is down: authentication mode changed
R1(config-if)#ip authentication key-chain eigrp 100 charhai
R1(config-if)#

(后面对KEY的更改):
R1(config)#key chain charhai
R1(config-keychain)#key 1
R1(config-keychain-key)#accept-lifetime 11:00:00 14 mar 2009 11:35:00 14 mar 2009
R1(config-keychain-key)#send-lifetime 11:00:00 14 mar 2009 11:35:00 14 mar 2009
R1(config-keychain-key)#exit
R1(config-keychain)#key 2
R1(config-keychain-key)#accept-lifetime 11:35:00 14 mar 2009 infinite
R1(config-keychain-key)#send-lifetime 11:35:00 14 mar 2009 infinite

R1#show key chain charhai
Key-chain charhai:
    key 1 -- text "cisco12"
        accept lifetime (11:20:00 UTC Mar 14 2009) - (11:35:00 UTC Mar 14 2009)[valid
now]
        send lifetime (11:20:00 UTC Mar 14 2009) - (11:35:00 UTC Mar 14 2009)[alid now]
    key 2 -- text "cisco"
        accept lifetime (11:35:00 UTC Mar 14 2009) - (infinite)
        send lifetime (11:35:00 UTC Mar 14 2009) - (infinite)




--------------------R2---------------------

Router>enable
Router#conf t
Router(config)#hostname R2
R2(config)#enable secret cisco
R2(config)#line console 0
R2(config-line)#exec-timeout 30 0
R2(config-line)#logging synchronous
R2(config-line)#exit
R2(config)#interface s1/0
R2(config-if)#ip address 192.168.20.2 255.255.255.252
R2(config-if)#no shutdown
R2(config-if)#interface loopback 0
R2(config-if)#ip address 192.168.30.1 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#router eigrp 100
R2(config-router)#no auto-summary
R2(config-router)#network 192.168.20.0 0.0.0.3
R2(config-router)#network 192.168.30.0 0.0.0.255

R2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C    192.168.30.0/24 is directly connected, Loopback0
D    192.168.10.0/24 [90/2297856] via 192.168.20.1, 00:07:39, Serial1/0
     192.168.20.0/30 is subnetted, 1 subnets
C       192.168.20.0 is directly connected, Serial1/0

R2#
*Mar  1 00:40:11.179: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.20.1
(Serial1/0) is down: Auth failure
R2#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R2(config)#key chain dy
R2(config-keychain)#key 1
R2(config-keychain-key)#key-string cisco12
R2(config-keychain-key)#exit
R2(config-keychain)#exit
R2(config)#interface s1/0
R2(config-if)#ip authentication mode eigrp 100 md5
R2(config-if)#ip authentication key-chain eigrp 100 dy

R2(config)#key chain dy
R2(config-keychain)#key 1
R2(config-keychain-key)#accept-lifetime 11:00:00 14 mar 2009 11:35:00 14 mar 2009
R2(config-keychain-key)#send-lifetime 11:00:00 14 mar 2009 11:35:00 14 mar 2009
R2(config-keychain-key)#exit
R2(config-keychain)#key 2
R2(config-keychain-key)#accept-lifetime 11:35:00 14 mar 2009 infinite
R2(config-keychain-key)#send-lifetime 11:35:00 14 mar 2009 infinite

R2#show key chain dy
Key-chain dy:
    key 1 -- text "cisco12"
        accept lifetime (11:20:00 UTC Mar 14 2009) - (11:35:00 UTC Mar 14 2009)[valid
now]
        send lifetime (11:20:00 UTC Mar 14 2009) - (11:35:00 UTC Mar 14 2009) [valid
now]
    key 2 -- text "cisco"
        accept lifetime (11:35:00 UTC Mar 14 2009) - (infinite)
        send lifetime (11:35:00 UTC Mar 14 2009) - (infinite)


R1#debug eigrp packets
Mar 14 11:34:56.571: EIGRP: received packet with MD5 authentication, key id = 1
Mar 14 11:34:56.575: EIGRP: Received HELLO on Serial1/0 nbr 192.168.20.2

Mar 14 11:34:56.579:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
Mar 14 11:34:59.459: EIGRP: Sending HELLO on Loopback0
Mar 14 11:34:59.463:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
Mar 14 11:34:59.471: EIGRP: Received HELLO on Loopback0 nbr 192.168.10.1
Mar 14 11:34:59.475:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0
Mar 14 11:34:59.475: EIGRP: Packet from ourselves ignored
Mar 14 11:34:59.831: EIGRP: Sending HELLO on Serial1/0
Mar 14 11:34:59.835:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
Mar 14 11:34:59.867: EIGRP: pkt authentication key id = 2, key not defined or not live
Mar 14 11:34:59.871: EIGRP: Serial1/0: ignored packet from 192.168.20.2, opcode= 5
(invalid authentication)
Mar 14 11:34:59.871: EIGRP: Dropping peer, invalid authentication
Mar 14 11:34:59.875: EIGRP: Sending HELLO on Serial1/0
Mar 14 11:34:59.879:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
R1#show key chain charhai
Mar 14 11:34:59.883: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.20.2
(Serial1/0) is down: Auth failure
R1#no debug eigrp packets
Mar 14 11:35:04.187: EIGRP: Sending HELLO on Loopback0
Mar 14 11:35:04.187:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
Mar 14 11:35:04.187: EIGRP: Received HELLO on Loopback0 nbr 192.168.10.1
Mar 14 11:35:04.187:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0
Mar 14 11:35:04.187: EIGRP: Packet from ourselves ignored
Mar 14 11:35:04.459: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:04.463: EIGRP: Received HELLO on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:04.463:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0
Mar 14 11:35:04.467: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.20.2
(Serial1/0) is up:new adjacency
Mar 14 11:35:04.471: EIGRP: Enqueueing UPDATE on Serial1/0 nbr 192.168.20.2 iidbQ
un/rely 0/1 peerQ un/rely 0/0
Mar 14 11:35:04.475: EIGRP: Requeued unicast on Serial1/0
Mar 14 11:35:04.479: EIGRP: Sending UPDATE on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:04.483:   AS 100, Flags 0x1, Seq 17/0 idbQ 0/0 iidbQ un/rely 0/0 pe
R1#no debug eigrp packets
Mar 14 11:35:04.483: EIGRP: Enqueueing UPDATE on Serial1/0 iidbQ un/rely 0/1 serno 2-3
Mar 14 11:35:04.483: EIGRP: Sending HELLO on Serial1/0
Mar 14 11:35:04.483:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/1
Mar 14 11:35:04.487: EIGRP: Enqueueing UPDATE on Serial1/0 nbr 192.168.20.2 iidbQ
un/rely 0/0 peerQ un/rely 0/1 serno 2-3
Mar 14 11:35:04.563: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:04.567: EIGRP: Received HELLO on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:04.567:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ
un/rely 0/2
Mar 14 11:35:04.603: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:04.603: EIGRP: Received UPDATE on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:04.607:   AS 100, Flags 0x1, Seq 21/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ
un/rely 0/2
R1#no debug eigrp packets
Mar 14 11:35:06.483: EIGRP: Sending UPDATE on Serial1/0 nbr 192.168.20.2, retry 1, RTO
3000
Mar 14 11:35:06.483:   AS 100, Flags 0x1, Seq 17/21 idbQ 0/0 iidbQ un/rely 0/0 peerQ
un/rely 0/2
Mar 14 11:35:06.507: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:06.511: EIGRP: Received UPDATE on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.511:   AS 100, Flags 0x8, Seq 22/17 idbQ 0/0 iidbQ un/rely 0/0 peerQ
un/rely 0/2
Mar 14 11:35:06.519: EIGRP: Enqueueing ACK on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.519:   Ack seq 22 iidbQ un/rely 0/1 peerQ un/rely 1/1
Mar 14 11:35:06.527: EIGRP: Suppressed ACK 22 to 192.168.20.2 on Serial1/0
Mar 14 11:35:06.531: EIGRP: Sending UPDATE on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.535:   AS 100, Flags 0x8, Seq 18/22 idbQ 0/0 iidbQ un/rely 0/1 peerQ
un/rely 0/1 serno 2-3
Mar 14 11:35:06.547: EIGRP: Requeued unicast on Serial1/0
Mar 14 11:35:06.587: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11
R1#no :35:06.591: EIGRP: Received UPDATE on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.591:   AS 100, Flags 0x8, Seq 23/18 idbQ 0/0 iidbQ un/rely 0/0 p
eerQ un/rely 0/2
Mar 14 11:35:06.595: EIGRP: Serial1/0 multicast flow blocking cleared
Mar 14 11:35:06.599: EIGRP: Enqueueing UPDATE on Serial1/0 iidbQ un/rely 0/1 ser
no 8-8
Mar 14 11:35:06.603: EIGRP: Enqueueing ACK on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.607:   Ack seq 23 iidbQ un/rely 0/1 peerQ un/rely 1/1
Mar 14 11:35:06.611: EIGRP: Suppressed ACK 23 to 192.168.20.2 on Serial1/0
Mar 14 11:35:06.615: EIGRP: Sending UPDATE on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.619:   AS 100, Flags 0x8, Seq 19/23 idbQ 0/0 iidbQ un/rely 0/1 p
eerQ un/rely 0/1 serno 2-3
Mar 14 11:35:06.627: EIGRP: Enqueueing UPDATE on Serial1/0 nbr 192.168.20.2 iidb
Q un/rely 0/0 peerQ un/rely 0/1 serno 8-8
Mar 14 11:35:06.659: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:06.663: EIGRP: Received UPDATE on Serial1/0 nbr 192.168.
R1#no 20.2g eigrp packets
Mar 14 11:35:06.663:   AS 100, Flags 0x0, Seq 24/19 idbQ 0/0 iidbQ un/rely 0/0 p
eerQ un/rely 0/2
Mar 14 11:35:06.671: EIGRP: Enqueueing ACK on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.671:   Ack seq 24 iidbQ un/rely 0/0 peerQ un/rely 1/1
Mar 14 11:35:06.675: EIGRP: Suppressed ACK 24 to 192.168.20.2 on Serial1/0
Mar 14 11:35:06.679: EIGRP: Sending UPDATE on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.683:   AS 100, Flags 0x0, Seq 20/24 idbQ 0/0 iidbQ un/rely 0/0 p
eerQ un/rely 0/1 serno 8-8
Mar 14 11:35:06.795: EIGRP: Received ACK on Serial1/0 nbr 192.168.20.2
Mar 14 11:35:06.799:   AS 100, Flags 0x0, Seq 0/20 idbQ 0/0 iidbQ un/rely 0/0 pe
erQ un/rely 0/1
Mar 14 11:35:06.799: EIGRP: Serial1/0 multicast flow blocking cleared
R1#no debug eigrp packets
Mar 14 11:35:08.619: EIGRP: Sending HELLO on Loopback0
Mar 14 11:35:08.623:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
Mar 14 11:35:08.631: EIGRP: Received HELLO on Loopback0 nbr 192.168.10.1
Mar 14 11:35:08.631:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0
Mar 14 11:35:08.635: EIGRP: Packet from ourselves ignored

R2#
Mar 14 11:34:58.455: EIGRP: received packet with MD5 authentication, key id = 1
Mar 14 11:34:58.459: EIGRP: Received HELLO on Serial1/0 nbr 192.168.20.1
Mar 14 11:34:58.459:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 pee
rQ un/rely 0/0
R2#
Mar 14 11:34:59.607: EIGRP: Sending HELLO on Serial1/0
Mar 14 11:34:59.611:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
R2#
Mar 14 11:35:01.203: EIGRP: Sending HELLO on Loopback0
Mar 14 11:35:01.207:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
Mar 14 11:35:01.219: EIGRP: Received HELLO on Loopback0 nbr 192.168.30.1
Mar 14 11:35:01.223:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0
Mar 14 11:35:01.223: EIGRP: Packet from ourselves ignored
R2#
Mar 14 11:35:02.895: EIGRP: pkt authentication key id = 1, key not defined or no
t live
Mar 14 11:35:02.899: EIGRP: Serial1/0: ignored packet from 192.168.20.1, opcode
= 5 (invalid authentication)
Mar 14 11:35:02.899: EIGRP: Dropping peer, invalid authentication
Mar 14 11:35:02.903: EIGRP: Sending HELLO on Serial1/0
Mar 14 11:35:02.907:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
Mar 14 11:35:02.927: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.20.1 (
Serial1/0) is down: Auth failure
R2#
Mar 14 11:35:02.971: EIGRP: pkt authentication key id = 1, key not defined or no
t live
Mar 14 11:35:02.971: EIGRP: Serial1/0: ignored packet from 192.168.20.1, opcode
= 5 (invalid authentication)
R2#
Mar 14 11:35:05.959: EIGRP: Sending HELLO on Loopback0
Mar 14 11:35:05.959:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
Mar 14 11:35:05.959: EIGRP: Received HELLO on Loopback0 nbr 192.168.30.1
Mar 14 11:35:05.959:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0
Mar 14 11:35:05.959: EIGRP: Packet from ourselves ignored
Mar 14 11:35:07.515: EIGRP: Sending HELLO on Serial1/0
Mar 14 11:35:07.519:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
Mar 14 11:35:07.543: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:07.547: EIGRP: Received UPDATE on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:07.551:   AS 100, Flags 0x1, Seq 17/0 idbQ 0/0
Mar 14 11:35:07.551: EIGRP: Neighbor(192.168.20.1) not yet found
Mar 14 11:35:07.551: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:07.551: EIGRP: Received HELLO on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:07.551:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0
Mar 14 11:35:07.551: %DUAL-5-NBRCHANGE
R2#: IP-EIGRP(0) 100: Neighbor 192.168.20.1 (Serial1/0) is up: new adjacency
Mar 14 11:35:07.551: EIGRP: Enqueueing UPDATE on Serial1/0 nbr 192.168.20.1 iidb
Q un/rely 0/1 peerQ un/rely 0/0
Mar 14 11:35:07.555: EIGRP: Sending HELLO on Serial1/0
Mar 14 11:35:07.559:   AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/1
Mar 14 11:35:07.563: EIGRP: Requeued unicast on Serial1/0
Mar 14 11:35:07.567: EIGRP: Enqueueing UPDATE on Serial1/0 iidbQ un/rely 0/1 ser
no 1-2
Mar 14 11:35:07.571: EIGRP: Sending UPDATE on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:07.575:   AS 100, Flags 0x1, Seq 21/0 idbQ 0/0 iidbQ un/rely 0/1 pe
erQ un/rely 0/1
Mar 14 11:35:07.579: EIGRP: Enqueueing UPDATE on Serial1/0 nbr 192.168.20.1 iidb
Q un/rely 0/0 peerQ un/rely 0/1 serno 1-2
R2#debug ei p
Mar 14 11:35:09.523: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:09.527: EIGRP: Received UPDATE on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:09.527:   AS 100, Flags 0x1, Seq 17/21 idbQ 0/0 iidbQ un/rely 0/0 p
eerQ un/rely 0/2
Mar 14 11:35:09.535: EIGRP: Enqueueing ACK on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:09.535:   Ack seq 17 iidbQ un/rely 0/1 peerQ un/rely 1/1
Mar 14 11:35:09.543: EIGRP: Suppressed ACK 17 to 192.168.20.1 on Serial1/0
Mar 14 11:35:09.547: EIGRP: Sending UPDATE on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:09.547:   AS 100, Flags 0x8, Seq 22/17 idbQ 0/0 iidbQ un/rely 0/1 p
eerQ un/rely 0/1 serno 1-2
Mar 14 11:35:09.555: EIGRP: Requeued unicast on Serial1/0
Mar 14 11:35:09.623: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:09.627: EIGRP: Received UPDATE on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:09.627:   AS 100, Flags 0x8, Seq 18/22 idbQ 0/0 iidbQ un/rely 0/0 p
eerQ un/rely 0/2
Mar 14 11:35:09.631: EIGRP
R2#: Serial1/0 multicast flow blocking cleared
Mar 14 11:35:09.631: EIGRP: Enqueueing ACK on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:09.631:   Ack seq 18 iidbQ un/rely 0/0 peerQ un/rely 1/1
Mar 14 11:35:09.635: EIGRP: Suppressed ACK 18 to 192.168.20.1 on Serial1/0
Mar 14 11:35:09.639: EIGRP: Sending UPDATE on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:09.643:   AS 100, Flags 0x8, Seq 23/18 idbQ 0/0 iidbQ un/rely 0/0 p
eerQ un/rely 0/1 serno 1-2
Mar 14 11:35:09.647: EIGRP: Enqueueing UPDATE on Serial1/0 iidbQ un/rely 0/1 ser
no 7-7
Mar 14 11:35:09.651: EIGRP: Enqueueing UPDATE on Serial1/0 nbr 192.168.20.1 iidb
Q un/rely 0/0 peerQ un/rely 0/1 serno 7-7
Mar 14 11:35:09.679: EIGRP: received packet with MD5 authentication, key id = 2
Mar 14 11:35:09.679: EIGRP: Received UPDATE on Serial1/0 nbr 192.168.20.1
Mar 14 11:35:09.679:   AS 100, Flags 0x8, Seq 19/23 idbQ 0/0 iidbQ un/rely 0/0 p
eerQ un/rely 0/2
Mar 14 11:35:09.679: EIGRP: Enqueueing ACK on Serial1/0 nbr 192.168.20.1

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