问题描述
1、客户现网组网结构如下图所示：
2、三台交换机运行ospf
3、DS_01和DS_02无法正常建立ospf邻居关系
4、DS_01和DS_02互联接口为up状态，但ping不通
处理过程
1、关闭DS_01跟DS_02互联接口STP
[DS_01-GigabitEthernet0/0/1]stp dis
[DS_01-GigabitEthernet0/0/1]
Jun 18 2013 10:00:44-08:00 DS_01 DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.25.191.3.1 configurations have been changed. The current change number is 46, the change loop count is 0, and the maximum number of records is 4095.
[DS_01-GigabitEthernet0/0/1]
Jun 18 2013 10:00:57-08:00 DS_01 %%01OSPF/4/NBR_CHANGE_E(l)[0]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.2, NeighborEvent=HelloReceived, NeighborPreviousState=Down, NeighborCurrentState=Init)
Jun 18 2013 10:01:01-08:00 DS_01 %%01OSPF/4/NBR_CHANGE_E(l)[1]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.2, NeighborEvent=2WayReceived, NeighborPreviousState=Init, NeighborCurrentState=ExStart)
Jun 18 2013 10:01:01-08:00 DS_01 %%01OSPF/4/NBR_CHANGE_E(l)[2]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.2, NeighborEvent=NegotiationDone, NeighborPreviousState=ExStart, NeighborCurrentState=Exchange)
Jun 18 2013 10:01:02-08:00 DS_01 %%01OSPF/4/NBR_CHANGE_E(l)[3]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.2, NeighborEvent=ExchangeDone, NeighborPreviousState=Exchange, NeighborCurrentState=Loading)
Jun 18 2013 10:01:02-08:00 DS_01 %%01OSPF/4/NBR_CHANGE_E(l)[4]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.2, NeighborEvent=LoadingDone, NeighborPreviousState=Loading, NeighborCurrentState=Full)
2、1、关闭DS_02跟DS_01互联接口STP
[DS_02-GigabitEthernet0/0/1]stp dis
[DS_02-GigabitEthernet0/0/1]
Jun 18 2013 10:01:02-08:00 DS_02 %%01OSPF/4/NBR_CHANGE_E(l)[19]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.1, NeighborEvent=HelloReceived, NeighborPreviousState=Down, NeighborCurrentState=Init)
Jun 18 2013 10:01:02-08:00 DS_02 %%01OSPF/4/NBR_CHANGE_E(l)[20]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.1, NeighborEvent=2WayReceived, NeighborPreviousState=Init, NeighborCurrentState=ExStart)
Jun 18 2013 10:01:02-08:00 DS_02 %%01OSPF/4/NBR_CHANGE_E(l)[21]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.1, NeighborEvent=NegotiationDone, NeighborPreviousState=ExStart, NeighborCurrentState=Exchange)
Jun 18 2013 10:01:02-08:00 DS_02 %%01OSPF/4/NBR_CHANGE_E(l)[22]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.1, NeighborEvent=ExchangeDone, NeighborPreviousState=Exchange, NeighborCurrentState=Loading)
Jun 18 2013 10:01:02-08:00 DS_02 %%01OSPF/4/NBR_CHANGE_E(l)[23]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=10.1.1.1, NeighborEvent=LoadingDone, NeighborPreviousState=Loading, NeighborCurrentState=Full)
Jun 18 2013 10:01:05-08:00 DS_02 DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.25.191.3.1 configurations have been changed. The current change number is 47, the change loop count is 0, and the maximum number of records is 4095.
3、DS_01跟DS_02互联接口可以ping通
<DS_02>ping 10.1.1.1
PING 10.1.1.1: 56 data bytes, press CTRL_C to break
Reply from 10.1.1.1: bytes=56 Sequence=1 ttl=255 time=40 ms
Reply from 10.1.1.1: bytes=56 Sequence=2 ttl=255 time=30 ms
Reply from 10.1.1.1: bytes=56 Sequence=3 ttl=255 time=50 ms
Reply from 10.1.1.1: bytes=56 Sequence=4 ttl=255 time=50 ms
Reply from 10.1.1.1: bytes=56 Sequence=5 ttl=255 time=50 ms
--- 10.1.1.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 30/44/50 ms
4、DS_01和DS_02 ospf邻居正常建立
<DS_01>dis ospf peer
OSPF Process 1 with Router ID 10.1.0.254
Neighbors
Area 0.0.0.0 interface 10.1.1.1(Vlanif10)'s neighbors
Router ID: 10.1.0.253 Address: 10.1.1.2
State: Full Mode:Nbr is Slave Priority: 1
DR: 10.1.1.1 BDR: 10.1.1.2 MTU: 0
Dead timer due in 37 sec
Retrans timer interval: 5
Neighbor is up for 00:24:05
Authentication Sequence: [ 0 ]
根因
1、查看DS_01和DS_02接口状态：
<DS_02>dis inter g0/0/1
GigabitEthernet0/0/1 current state : UP
Line protocol current state : UP
Description:to DS_01
Switch Port, PVID : 10, TPID : 8100(Hex), The Maximum Frame Length is 9216
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 4c1f-cc71-34c6
Last physical up time : 2013-06-17 10:19:46 UTC-08:00
Last physical down time : 2013-06-17 10:19:45 UTC-08:00
Current system time: 2013-06-18 09:54:11-08:00
Hardware address is 4c1f-cc71-34c6
Last 300 seconds input rate 0 bytes/sec, 0 packets/sec
Last 300 seconds output rate 0 bytes/sec, 0 packets/sec
Input: 2712014 bytes, 24340 packets
Output: 390823 bytes, 4740 packets
Input:
Unicast: 73 packets, Multicast: 24204 packets
Broadcast: 63 packets
Output:
Unicast: 74 packets, Multicast: 4616 packets
Broadcast: 50 packets
Input bandwidth utilization : 0%
Output bandwidth utilization : 0%
2、ping互联接口地址：
<DS_02>ping 10.1.10.1
PING 10.1.10.1: 56 data bytes, press CTRL_C to break
Request time out
Request time out
Request time out
Request time out
Request time out
--- 10.1.10.1 ping statistics ---
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
3、查看接口stp状态：
[DS_01]dis stp inter g0/0/1
-------[CIST Global Info][Mode MSTP]-------
CIST Bridge :32768.4c1f-cc43-65a7
Config Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
Active Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
CIST Root/ERPC :32768.4c1f-cc37-0688 / 1
CIST RegRoot/IRPC :32768.4c1f-cc43-65a7 / 0
CIST RootPortId :128.26
BPDU-Protection :Disabled
TC or TCN received :45
TC count per hello :0
STP Converge Mode :Normal
Time since last TC :0 days 0h:13m:51s
Number of TC :8
Last TC occurred :GigabitEthernet0/0/2
----[Port25(GigabitEthernet0/0/1)][FORWARDING]----
Port Protocol :Enabled
Port Role :Designated Port
Port Priority :128
Port Cost(Dot1T ) :Config=auto / Active=1
Designated Bridge/Port :32768.4c1f-cc43-65a7 / 128.25
Port Edged :Config=default / Active=disabled
Point-to-point :Config=auto / Active=true
Transit Limit :147 packets/hello-time
Protection Type :None
Port STP Mode :MSTP
Port Protocol Type :Config=auto / Active=dot1s
BPDU Encapsulation :Config=stp / Active=stp
PortTimes :Hello 2s MaxAge 20s FwDly 15s RemHop 20
TC or TCN send :13
TC or TCN received :6
BPDU Sent :8109
TCN: 0, Config: 0, RST: 0, MST: 8109
BPDU Received :7
TCN: 0, Config: 0, RST: 0, MST: 7
<DS_02>dis stp inter g0/0/1
-------[CIST Global Info][Mode MSTP]-------
CIST Bridge :32768.4c1f-cc71-34c6
Config Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
Active Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
CIST Root/ERPC :32768.4c1f-cc37-0688 / 1
CIST RegRoot/IRPC :32768.4c1f-cc71-34c6 / 0
CIST RootPortId :128.27
BPDU-Protection :Disabled
TC or TCN received :58
TC count per hello :0
STP Converge Mode :Normal
Time since last TC :0 days 0h:11m:26s
Number of TC :9
Last TC occurred :GigabitEthernet0/0/3
----[Port25(GigabitEthernet0/0/1)][DISCARDING]----
Port Protocol :Enabled
Port Role :Alternate Port
Port Priority :128
Port Cost(Dot1T ) :Config=auto / Active=1
Designated Bridge/Port :32768.4c1f-cc43-65a7 / 128.25
Port Edged :Config=default / Active=disabled
Point-to-point :Config=auto / Active=true
Transit Limit :147 packets/hello-time
Protection Type :None
Port STP Mode :MSTP
Port Protocol Type :Config=auto / Active=dot1s
BPDU Encapsulation :Config=stp / Active=stp
PortTimes :Hello 2s MaxAge 20s FwDly 15s RemHop 20
TC or TCN send :6
TC or TCN received :13
BPDU Sent :7
TCN: 0, Config: 0, RST: 0, MST: 7
BPDU Received :8040
TCN: 0, Config: 0, RST: 0, MST: 8040
建议与总结
用交换机构建三层路由网络时，互联接口的STP要关闭，因为交换机的STP默认为开启状态，并且STP运算是以物理环路为主。
