3Com 4210G Series, Руководство по настройке, Страница: 975 / 1133

21-3
PING 1.1.2.2: 56 data bytes, press CTRL_C to break
Reply from 1.1.2.2: bytes=56 Sequence=1 ttl=254 time=53 ms
Record Route:
1.1.2.1
1.1.2.2
1.1.1.2
1.1.1.1
Reply from 1.1.2.2: bytes=56 Sequence=2 ttl=254 time=1 ms
Record Route:
1.1.2.1
1.1.2.2
1.1.1.2
1.1.1.1
Reply from 1.1.2.2: bytes=56 Sequence=3 ttl=254 time=1 ms
Record Route:
1.1.2.1
1.1.2.2
1.1.1.2
1.1.1.1
Reply from 1.1.2.2: bytes=56 Sequence=4 ttl=254 time=1 ms
Record Route:
1.1.2.1
1.1.2.2
1.1.1.2
1.1.1.1
Reply from 1.1.2.2: bytes=56 Sequence=5 ttl=254 time=1 ms
Record Route:
1.1.2.1
1.1.2.2
1.1.1.2
1.1.1.1
--- 1.1.2.2 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 1/11/53 ms
The principle of ping –r is as shown in Figure 21-1 .
1) The source (Device A) sends an ICMP echo request with the RR option being empty to the
destination (Device C).
2) The intermediate device (Device B) adds the IP address (1.1.2.1) of its outbound interface to the
RR option of the ICMP echo request, and forwards the packet.
3) Upon receiving the request, the destination device copies the RR option in the request and adds
the IP address (1.1.2.2) of its outbound interface to the RR option. Then the destination device
sends an ICMP echo reply.
4) The intermediate device adds the IP address (1.1.1.2) of its outbound interface to the RR option in
the ICMP echo reply, and then forwards the reply.