S6700EI is PE or P of the IP/MPLS backbone network. If the customer tried to ping the loopback IP address with packet’s size 7000byte, the last packet always dropped .And at the same time there is cpu-defend drop statistic under mpls-fib-hit. However the customer tried to ping the interface IP address with packet’s size 7000byte, it is always successful and no drop statistic under mpls-fib-hit.
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(1)ping the loopback IP address: [Switch]ping -f -s 7000 1.1.1.1 PING 1.1.1.1: 7000 data bytes, press CTRL_C to break Reply from 1.1.1.1: bytes=7000 Sequence=1 ttl=255 time=14 ms Reply from 1.1.1.1: bytes=7000 Sequence=2 ttl=255 time=11 ms Reply from 1.1.1.1: bytes=7000 Sequence=3 ttl=255 time=14 ms Reply from 1.1.1.1: bytes=7000 Sequence=4 ttl=255 time=27 ms Request time out
--- 1.1.1.1 ping statistics --- 5 packet(s) transmitted 4 packet(s) received 20.00% packet loss round-trip min/avg/max = 11/16/27 ms (2)ping the interface IP address: [Switch]ping -f -s 7000 100.0.0.2 PING 100.0.0.2: 7000 data bytes, press CTRL_C to break Reply from 100.0.0.2: bytes=7000 Sequence=1 ttl=254 time=2 ms Reply from 100.0.0.2: bytes=7000 Sequence=2 ttl=254 time=2 ms Reply from 100.0.0.2: bytes=7000 Sequence=3 ttl=254 time=2 ms Reply from 100.0.0.2: bytes=7000 Sequence=4 ttl=254 time=1 ms Reply from 100.0.0.2: bytes=7000 Sequence=5 ttl=254 time=2 ms
--- 100.0.0.2 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 1/1/2 ms |
The software version of S6700EI is V200R005.
This is the topology:
Root Cause
