关于eigrp holding time expired

AC2046

关于eigrp holding time expired

关于eigrp holding time expired

，拓扑如下

说明：1.cov1和cov2只是作为二层交换机使用。

     2.网络运行的是EIGRP协议，R1中的fa0/7和fa0/9作为三层借口，分别和ISP1和ISP2相连。

3.ip地址分配：isp1  s0/2 3.3.3.1（此实验中未用到）

                        Fa1/01.1.1.1

                   Isp2  s0/3 4.4.4.1（此实验中未用到）

                         Fa1/0 2.2.2.1

                   R1    fa0/7 1.1.1.2

                         Fa0/8 2.2.2.2

以上实验的掩码均为255.255.255.0

问题：1.shudown
fa0/9之后，r1 ping 1.1.1.1 可通（正常）

2.当shudown fa0/7之后（fa0/9处于uo），r1 ping 2.2.2.1 却不通，r1上如下的提示

错误提示：

#ping 2.2.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2.2.2.1,timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R1#

*Mar
1 01:10:29.899:%DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor 2.2.2.1(FastEthernet0/9) is down: holding time expired

Isp2路由上有如下的提示

*Mar
1 01:15:49.267:%DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor 2.2.2.2(FastEthernet1/0) is down: retry limit exceeded

此时的fa0/9端口和fa1/0端口却显示正常，如下

R1#ping 2.2.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2.2.2.1,timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R1#sh int fa0/9

FastEthernet0/9 is up, line protocol is up

Hardware is Fast Ethernet, address is cc00.17b8.f009 (bia cc00.17b8.f009)

Internet address is 2.2.2.2/24

MTU1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s

ARPtype: ARPA, ARP Timeout 04:00:00

Last input 00:02:05, output never, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5minute input rate 0 bits/sec, 0 packets/sec

5minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 403 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 input packets with dribble condition detected

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 11 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

ISP2#sh int fa1/0

FastEthernet1/0 is up,line protocol is up

Hardware is AmdFE, address is cc02.17b8.0010(bia cc02.17b8.0010)

Internet address is 2.2.2.1/24

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:00, outputhang never

Last clearing of "show interface"counters never

Input queue: 0/75/0/0(size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0packets/sec

5250 packets input, 357993 bytes

Received 4841 broadcasts, 0 runts, 0giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun,0 ignored

0 watchdog

0 input packets with dribble conditiondetected

3250 packets output, 269717 bytes, 0underruns

0 output errors, 0 collisions, 1 interfaceresets

当我把r1上的fa0/9和isp1/0的端口，shut和弄no sh之后，r1可正常ping通2.2.2.1

请大家帮忙解决一下！谢谢

ISP1.和isp2、R1的协议信息如下

ISP1#ship pro

Routing Protocol is "eigrp 10"

Outgoing ** filter list for all interfaces is not set

Incoming ** filter list for all interfaces is not set

Default networks flagged in outgoing **s

Default networks accepted from incoming **s

EIGRP metric weight K1=1, K2=0, K3=1,K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Redistributing: eigrp 10

EIGRP NSF-aware route hold timer is 240s

Automatic network summarization is not in effect

Maximum path: 4

Routing for Networks:

1.1.1.0/24

3.3.3.0/24

Routing Information Sources:

Gateway
Distance
Last **

3.3.3.2
90
01:16:43

1.1.1.2
90
00:07:46

Distance: internal 90 external 170

ISP2#ship pro   

Routing Protocol is "eigrp 10"

Outgoing ** filter list for all interfaces is not set

Incoming ** filter list for all interfaces is not set

Default networks flagged in outgoing **s

Default networks accepted from incoming **s

EIGRP metric weight K1=1, K2=0, K3=1,K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Redistributing: eigrp 10

EIGRP NSF-aware route hold timer is 240s

Automatic network summarization is not in effect

Maximum path: 4

Routing for Networks:

2.2.2.0/24

4.4.4.0/24

Routing Information Sources:

Gateway
Distance
Last **

2.2.2.2
90
00:06:19

4.4.4.2
90
01:17:20

Distance: internal 90 external 170

R1#ship pro

Routing Protocol is "eigrp 10"

Outgoing ** filter list for all interfaces is not set

Incoming ** filter list for all interfaces is not set

Default networks flagged in outgoing **s

Default networks accepted from incoming **s

EIGRP metric weight K1=1, K2=0, K3=1,K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Redistributing: eigrp 10

EIGRP NSF-aware route hold timer is 240s

Automatic network summarization is not in effect

Maximum path: 4

Routing for Networks:

1.1.1.0/24

2.2.2.0/24

Routing Information Sources:

Gateway
Distance
Last **

1.1.1.1
90
00:45:53

2.2.2.1
90
01:05:59

Jeff.

这个和EIGRP本身没什么太多的关系，只是你中间的switching的问题，应该是你机器模拟交换机的问题，建议中间直接挂一个2层交换机即可，关于eigrp的hold time exp的问题就是延迟太大导致的在hold 时间没有接收到对方的hello包....

王晓强

了解下，EIGRP这个问题，可以参考《TCP/IP卷一》的EIGRP部分，看看，里面有详细的说明和举例。

kkingkill

如果PC的CPU不够强大的话，那么，EIGRP会不断UP/DOWN，我的电脑就是如此，CPUT5870

AC2046

非常感谢大家的解答，也非常感谢晓强老师的指引，对Eigrp有了进一步的认识，先去看看《TCP/IP卷一》这本书

喵喵

有问题上论坛，都是好孩子。

林原静羽

有问题多讨论，多交流~
通过网络和查阅书籍会学习更多~

亮晶晶

AC2046

很多问题对大家来说很简单,对我来说却有点复杂,希望大家能多多指教了.

tieqilin

如果PC的CPU不够强大的话，那么，EIGRP会不断UP/DOWN水星家纺