核心光口一直闪断，下游设备也有端口闪断，是否存在tc震荡如何解决

<H3C>

<H3C>dis 

<H3C>display loop

<H3C>display loopback-detection 

Loopback detection is enabled.

Loopback detection interval is 250 second(s).

No loopback is detected.

<H3C>dis

<H3C>display stp

<H3C>display stp tc

 -------------- STP slot 1 TC or TCN count -------------

 MST ID   Port                                Receive  Send

 0        Bridge-Aggregation1                 0        76504    

 0        GigabitEthernet1/0/17               71       76376    

 0        GigabitEthernet1/0/18               2        76508    

 0        GigabitEthernet1/0/19               0        34460    

 0        GigabitEthernet1/0/21               0        76504    

 0        GigabitEthernet1/0/22               0        76504    

 0        GigabitEthernet1/0/24               0        76504    

 0        Ten-GigabitEthernet1/0/26           7566     62040    

 0        Ten-GigabitEthernet1/0/27           31608    7648     

Ten-GigabitEthernet1/0/26

Current state: UP

Line protocol state: UP

IP packet frame type: Ethernet II, hardware address: 9023-b400-68a3

Description: Ten-GigabitEthernet1/0/26 Interface

Bandwidth: 1000000 kbps

Loopback is not set

Media type is optical fiber, Port hardware type is 1000_BASE_SX_SFP

1000Mbps-speed mode, full-duplex mode

Link speed type is force link, link duplex type is force link

Flow-control is not enabled

Maximum frame length: 10000

Allow jumbo frames to pass

Broadcast max-ratio: 100%

Multicast max-ratio: 100%

Unicast max-ratio: 100%

PVID: 3        

MDI type: Automdix

Port link-type: Access

 Tagged VLANs:   None

 Untagged VLANs: 3

Port priority: 0

Last link flapping: 33 weeks 1 days 17 hours 26 minutes

Last clearing of counters: Never

 Peak input rate: 19160862 bytes/sec, at 2013-05-26 11:58:04 

 Peak output rate: 115320686 bytes/sec, at 2013-05-09 14:02:50 

 Last 300 second input: 379 packets/sec 258589 bytes/sec 0%

 Last 300 second output: 304 packets/sec 126968 bytes/sec 0%

 Input (total):  3022733592 packets, 1779402370679 bytes

         3006295826 unicasts, 2670971 broadcasts, 13766795 multicasts, 0 pauses

 Input (normal):  3022733592 packets, - bytes

         3006295826 unicasts, 2670971 broadcasts, 13766795 multicasts, 0 pauses

 Input:  0 input errors, 0 runts, 0 giants, 0 throttles

         0 CRC, 0 frame, - overruns, 0 aborts

         - ignored, - parity errors

 Output (total): 3448373252 packets, 3176479285048 bytes

         3436975208 unicasts, 582362 broadcasts, 10815682 multicasts, 0 pauses

 Output (normal): 3448373252 packets, - bytes

         3436975208 unicasts, 582362 broadcasts, 10815682 multicasts, 0 pauses

 Output: 0 output errors, - underruns, - buffer failures

         0 aborts, 0 deferred, 0 collisions, 0 late collisions

         0 lost carrier, - no carrier

Ten-GigabitEthernet1/0/27

Current state: UP

Line protocol state: UP

IP packet frame type: Ethernet II, hardware address: 9023-b400-68a4

Description: Ten-GigabitEthernet1/0/27 Interface

Bandwidth: 1000000 kbps

Loopback is not set

Media type is optical fiber, Port hardware type is 1000_BASE_SX_SFP

1000Mbps-speed mode, full-duplex mode

Link speed type is force link, link duplex type is force link

Flow-control is not enabled

Maximum frame length: 10000

Allow jumbo frames to pass

Broadcast max-ratio: 100%

Multicast max-ratio: 100%

Unicast max-ratio: 100%

PVID: 4        

MDI type: Automdix

Port link-type: Access

 Tagged VLANs:   None

 Untagged VLANs: 4

Port priority: 0

Last link flapping: 33 weeks 1 days 17 hours 26 minutes

Last clearing of counters: Never

 Peak input rate: 20494184 bytes/sec, at 2013-01-19 16:17:56 

 Peak output rate: 86769413 bytes/sec, at 2013-06-13 15:32:52 

 Last 300 second input: 559 packets/sec 132548 bytes/sec 0%

 Last 300 second output: 1434 packets/sec 1857470 bytes/sec 1%

 Input (total):  6716213457 packets, 4659461641905 bytes

         6679833168 unicasts, 6477285 broadcasts, 29903004 multicasts, 0 pauses

 Input (normal):  6716213457 packets, - bytes

         6679833168 unicasts, 6477285 broadcasts, 29903004 multicasts, 0 pauses

 Input:  0 input errors, 0 runts, 0 giants, 0 throttles

         0 CRC, 0 frame, - overruns, 0 aborts

         - ignored, - parity errors

 Output (total): 7910127021 packets, 6937415746059 bytes

         7895987332 unicasts, 13343955 broadcasts, 795734 multicasts, 0 pauses

 Output (normal): 7910127021 packets, - bytes

         7895987332 unicasts, 13343955 broadcasts, 795734 multicasts, 0 pauses

 Output: 0 output errors, - underruns, - buffer failures

         0 aborts, 0 deferred, 0 collisions, 0 late collisions

         0 lost carrier, - no carrier