H3c-technologies H3C WX6000 Series Access Controllers Manuale Utente Scaricare il pdf (Pagina 63)

5-3

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 5-1.

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.

5) Upon receiving the reply, the source device adds the IP address (1.1.1.1) of its inbound interface to

the RR option. Finally, you can get the detailed information of routes from Device A to Device C:

1.1.1.1 <-> {1.1.1.2; 1.1.2.1} <-> 1.1.2.2.

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 178 179

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H3c-technologies H3C WX6000 Series Access Controllers Manuale Utente Pagina 63

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