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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.
(1)ping the loopback IP address:
[Switch]ping -f -s 7000 184.108.40.206
PING 220.127.116.11: 7000 data bytes, press CTRL_C to break
Reply from 18.104.22.168: bytes=7000 Sequence=1 ttl=255 time=14 ms
Reply from 22.214.171.124: bytes=7000 Sequence=2 ttl=255 time=11 ms
Reply from 126.96.36.199: bytes=7000 Sequence=3 ttl=255 time=14 ms
Reply from 188.8.131.52: bytes=7000 Sequence=4 ttl=255 time=27 ms
Request time out
--- 184.108.40.206 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 220.127.116.11
PING 18.104.22.168: 7000 data bytes, press CTRL_C to break
Reply from 22.214.171.124: bytes=7000 Sequence=1 ttl=254 time=2 ms
Reply from 126.96.36.199: bytes=7000 Sequence=2 ttl=254 time=2 ms
Reply from 188.8.131.52: bytes=7000 Sequence=3 ttl=254 time=2 ms
Reply from 184.108.40.206: bytes=7000 Sequence=4 ttl=254 time=1 ms
Reply from 220.127.116.11: bytes=7000 Sequence=5 ttl=254 time=2 ms
--- 18.104.22.168 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:
(1) We checked the cpu-defend statistic and found that when the customer ping the loopback address it matched the packet type of mpls-fib-hit, and there are drop statistics on the packet type of mpls-fib-hit. However, when the customer ping the interface address it matched the packet type of ICMP, and there are no drop statistics on the packet type of ICMP.
(1)the cpu-defend statistic when ping the loopback IP address:
(2)the cpu-defend statistic when ping the interface IP address:
(2) Why the customer ping different IP address, the ICMP packets matched different packet type. Because the switch only distributes mpls label to the IP host routes with 32-bit addresses by default, and won’t distributes mpls label to the direct route.
The mpls lsp:
The mpls configuration:
(3) The packet will include the mpls head when you ping the loopback address, but the packet won’t include the mpls head when you ping the interface address. The priority of mpls-fib-hit is higher than ICMP, so the packets with the mpls head are matched the packet type of mpls-fib-hit.
(4) Why the last packet always dropped when the customer ping the loopback IP address. Because the cpcar of the packet type of ICMP is larger than mpls-fib-hit.
(1)the cpcar of ICMP:
(2) the cpcar of mpls-fib-hit:
(5) For huawei switch, the data packets are transferred by the chips, and it won’t affect the business and the ping test is only used to check the network is connected well.
The switch only distributes mpls label to the IP host routes with 32-bit addresses by default, and won’t distributes mpls label to the direct route. The ICMP packets with the mpls head are matched the packet type of mpls-fib-hit, but the ICMP packets without the mpls head are matched the packet type of ICMP. And the cpcar of the packet type of ICMP is larger than mpls-fib-hit.
This is a normal behavior for our switch and it won’t affect the business.