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路由器設置可選擇性數據包丟棄(2)
2007-08-30   中國IT實驗室 

=== aggressive mode ===

* 如果spd工作在aggressive mode,所有的畸形包會被丟棄,例如invalid checksum、incorrect version、incorrect header length、incorrect packet length等。

* 通過命令ip spd mode aggressive開啟aggressive mode

* 12000系列路由器不支持aggressive mode,因為畸形包在會被每個linecard丟棄,而不需要由GRP(gigabit route processor)處理

==== Input Queue Check ====

=== input queue ===

SPD state check是基于RP的,而Input Queue Check是基于interface的。如果不開啟spd的話,默認情況下每個interface的queue是75,當queue中的數據大于75時,大于75的部分會被丟棄。這個queue可以通過show interface看到。

GigabitEthernet1/2 is up, line protocol is up 

Hardware is GigMac 3 Port GigabitEthernet, address is 0005.5ffd.4082

(bia 0005.5ffd.4082)

Description: sample

Internet address is x.x.x.x/30

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, rely 255/255, load 131/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full Duplex, 1000Mbps, link type is force-up, media type is LX

output flow-control is unsupported, input flow-control is unsupported

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

Last input 00:00:00, output 00:00:03, output hang never

Last clearing of "show interface" counters never

Queueing strategy: fifo

Output queue 0/40, 0 drops; input queue 0/75, 25 drops //[就在這里]

30 second input rate 613917000 bits/sec, 122041 packets/sec

30 second output rate 517166000 bits/sec, 123695 packets/sec

77400124545 packets input, 44369025705444 bytes, 0 no buffer

Received 5898 broadcasts, 0 runts, 0 giants, 0 throttles

647964 input errors, 0 CRC, 0 frame, 485923 overrun, 162041 ignored

0 watchdog, 0 multicast, 0 pause input

69912443364 packets output, 41951561990047 bytes, 0 underruns

Transmitted 1 broadcasts

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 pause output

0 output buffer failures, 0 output buffers swapped out

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