CCNP Day6 EIGRP查询机制

1、网络拓扑

 

 

1、 当1.1.1.0网络断开后，R1向R2发Querry包，查询R2到1.1.1.0的路由是否存在，如果R2到1.1.1.0的路由不存在，这时R2回复Replay给R1，R1更新删除1.1.1.0的路由条目。

2、 当1.1.1.0网络断开后，R1向R2发Querry包，查询R2到1.1.1.0的路由是否存在，如果R2到1.1.1.0的路由存在，但下一跳在R3上，这时R2回复Replay给R1，R1更新删除1.1.1.0的路由条目。

3、当1.1.1.0网络断开后，R1向R2发Querry包，查询R2到1.1.1.0的路由是否存在，如果R2到1.1.1.0的路由存在，且下一跳是R1，这时R2继续向R3查询到1.1.1.0网络的路由是否存在，此查询一直查到边界路由器。当边界路由器也无此路由时会回复Replay给上一跳路由器，全网删除到1.1.1.0的路由。

4、当1.1.1.0网络断开后，R1向R2发Querry包，查询R2到1.1.1.0的路由是否存在，如果R2到1.1.1.0的路由不存在，R2向R3查询，如果R3不向R2回复Replay，R2也无法及时向R1回复Replay, R2到R3的查询会在3分钟后超时；此时R1在等待90秒后，想R2发ISA的Query查询，R2收到后回复ISA的Replay。

2、R1  shutdown  Loopback 0后的Debug信息

R1#debug eigrp packets query reply ack 
EIGRP Packets debugging is on
    (QUERY, REPLY, ACK)
R1#
R1#
R1#
R1#config t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#interface loopback 0
R1(config-if)#shutdown 
R1(config-if)#
*Nov 28 13:51:29.555: EIGRP: Enqueueing QUERY on FastEthernet0/0 iidbQ un/rely 0/1 serno 16-16
*Nov 28 13:51:29.559: EIGRP: Sending QUERY on FastEthernet0/0
*Nov 28 13:51:29.559:   AS 100, Flags 0x0, Seq 15/0 idbQ 0/0 iidbQ un/rely 0/0 serno 16-16
*Nov 28 13:51:29.603: EIGRP: Received ACK on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.603:   AS 100, Flags 0x0, Seq 0/15 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/1
*Nov 28 13:51:29.619: EIGRP: Received QUERY on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.619:   AS 100, Flags 0x0, Seq 18/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Nov 28 13:51:29.619: EIGRP: Enqueueing ACK on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.623:   Ack seq 18 iidbQ un/rely 0/0 peerQ un/rely 1/0
*Nov 28 13:51:29.623: EIGRP: Sending ACK on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.623:   AS 100, Flags 0x0, Seq 0/18 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 1/0
*Nov 28 13:51:29.635: EIGRP: Enqueueing REPLY on FastEthernet0/0 
R1(config-if)#nbr 172.16.12.2 iidbQ un/rely 0/1 peerQ un/rely 0/0 serno 17-17
*Nov 28 13:51:29.643: EIGRP: Sending REPLY on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.643:   AS 100, Flags 0x0, Seq 16/18 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/1 serno 17-17
*Nov 28 13:51:29.663: EIGRP: Received ACK on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.663:   AS 100, Flags 0x0, Seq 0/16 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/1
*Nov 28 13:51:29.699: EIGRP: Received REPLY on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.699:   AS 100, Flags 0x0, Seq 19/16 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Nov 28 13:51:29.699: EIGRP: Enqueueing ACK on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.703:   Ack seq 19 iidbQ un/rely 0/0 peerQ un/rely 1/0
*Nov 28 13:51:29.703: EIGRP: Sending ACK on FastEthernet0/0 nbr 172.16.12.2
*Nov 28 13:51:29.703:   AS 100, Flags 0x0, Seq 0/19 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 1/0
R1(config-if)#
*Nov 28 13:51:31.539: %LINK-5-CHANGED: Interface Loopback0, changed state to administratively down
R1(config-if)#



R2#
*Nov 28 13:51:30.287: EIGRP: Received QUERY on FastEthernet0/0 nbr 172.16.12.1             /****收到R1的Querr
*Nov 28 13:51:30.287:   AS 100, Flags 0x0, Seq 15/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Nov 28 13:51:30.287: EIGRP: Enqueueing ACK on FastEthernet0/0 nbr 172.16.12.1
*Nov 28 13:51:30.291:   Ack seq 15 iidbQ un/rely 0/0 peerQ un/rely 1/0
*Nov 28 13:51:30.291: EIGRP: Sending ACK on FastEthernet0/0 nbr 172.16.12.1
*Nov 28 13:51:30.291:   AS 100, Flags 0x0, Seq 0/15 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 1/0
*Nov 28 13:51:30.303: EIGRP: Enqueueing QUERY on Serial1/0 iidbQ un/rely 0/1 serno 15-15
*Nov 28 13:51:30.303: EIGRP: Enqueueing QUERY on FastEthernet0/0 iidbQ un/rely 0/1 serno 15-15
*Nov 28 13:51:30.307: EIGRP: Enqueueing QUERY on Serial1/0 nbr 192.168.23.2 iidbQ un/rely 0/0 peerQ un/rely 0/0 serno 15-15
*Nov 28 13:51:30.307: EIGRP: Sending QUERY on FastEthernet0/0
*Nov 28 13:51:30.307:   AS 100, Flags 0x0, Seq 18/0 idbQ 0/0 iidbQ un/rely 0/0 serno 15-15
*Nov 28 13:51:30.311: EIGR
R2#P: Sending QUERY on Serial1/0 nbr 192.168.23.2




R3#debug eigrp packets query reply ack 
EIGRP Packets debugging is on
    (QUERY, REPLY, ACK)
R3#
*Nov 28 13:51:39.075: EIGRP: Received QUERY on Serial1/0 nbr 192.168.23.1
*Nov 28 13:51:39.075:   AS 100, Flags 0x0, Seq 17/8 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Nov 28 13:51:39.079: EIGRP: Enqueueing ACK on Serial1/0 nbr 192.168.23.1
*Nov 28 13:51:39.079:   Ack seq 17 iidbQ un/rely 0/0 peerQ un/rely 1/0
*Nov 28 13:51:39.087: EIGRP: Sending ACK on Serial1/0 nbr 192.168.23.1
*Nov 28 13:51:39.087:   AS 100, Flags 0x0, Seq 0/17 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 1/0
*Nov 28 13:51:39.091: EIGRP: Enqueueing REPLY on Serial1/0 nbr 192.168.23.1 iidbQ un/rely 0/1 peerQ un/rely 0/0 serno 10-10
*Nov 28 13:51:39.099: EIGRP: Sending REPLY on Serial1/0 nbr 192.168.23.1
R3#
*Nov 28 13:51:39.099:   AS 100, Flags 0x0, Seq 9/17 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/1 serno 10-10
*Nov 28 13:51:39.123: EIGRP: Received ACK on Serial1/0 nbr 192.168.23.1
*Nov 28 13:51:39.123:   AS 100, Flags 0x0, Seq 0/9 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/1
R3#