Information Technology Reference
In-Depth Information
IISP Routing
Figure 5-26
Router A
N
U
47.0091.8112.3400.11 via 1/0/0
47.0091.8112.3400.12 via 1/0/1
47.0091.8112.3400.111 via 1/0/1
47.0091.8112.3400.122 via 1/0/0
Switch A
1/0/0
1/0/1
N
N
U
U
Switch B
Switch C
47.0091.8112.3400.11 via 1/0/0
47.0091.8112.3400.1222 via 1/0/1
47.0091.8112.3400.12 via 1/0/0
47.0091.8112.3400.1111 via 1/0/1
U
N
N
N
U
U
Router B
Router C
47.0091.8112.3400.1222.0ca7…
47.0091.8112.3400.1111.0ca7…
U = User side
N = Network side
IISP can also provide a route between different PNNI peer groups. This is useful when the
PNNI peer groups are administered separately or support different versions of PNNI.
Classical IP over ATM (CIA) (RFC 2225)
CIA is specified in RFC 2225. The purpose of RFC 2225 is to provide a method to send IP
packets over ATM. In the RFC 2225 approach, each device that wants to send an IP packet over
ATM is directly attached to the ATM network. This device can be a workstation or a router that
acts as a proxy for an entire LAN.
For each logical IP subnet (LIS), an ATM ARP server is configured. The job of the ATM ARP
server is to map IP addresses to the ATM network service access point (NSAP) or ITU-T E-164
addresses. Figure 5-27 shows how the ATM ARP server learns the addresses of the ARP clients.
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