45
100 bytes from 10.1.1.1: Sequence=3 time=1 ms
100 bytes from 10.1.1.1: Sequence=4 time=1 ms
100 bytes from 10.1.1.1: Sequence=5 time=1 ms
--- FEC: 11.1.1.0/24 ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max = 1/1/1 ms
160BLabel advertisement control configuration example
351BNetwork requirements
Two links, Switch A—Switch B—Switch C and Switch A—Switch D—Switch C, exist between
subnets 11.1.1.0/24 and 21.1.1.0/24.
Configure LDP to establish LSPs only for routes to subnets 11.1.1.0/24 and 21.1.1.0/24.
Configure LDP to establish LSPs only on the link Switch A—Switch B—Switch C to forward traffic
between subnets 11.1.1.0/24 and 21.1.1.0/24.
Figure 19 Network diagram
352BRequirements analysis
• To ensure that the LSRs establish IPv4 LSPs automatically, enable IPv4 LDP on each LSR.
• To establish IPv4 LDP LSPs, configure an IPv4 routing protocol to ensure IP connectivity
between the LSRs. This example uses OSPF.
• To ensure that LDP establishes IPv4 LSPs only for the routes 11.1.1.0/24 and 21.1.1.0/24,
configure IPv4 LSP generation policies on each LSR.
• To ensure that LDP establishes IPv4 LSPs only over the link Switch A—Switch B—Switch C,
configure IPv4 label advertisement policies as follows:
{ Switch A advertises only the label mapping for FEC 11.1.1.0/24 to Switch B.
{ Switch C advertises only the label mapping for FEC 21.1.1.0/24 to Switch B.
{ Switch D does not advertise label mapping for FEC 21.1.1.0/24 to Switch A. Switch D does
not advertise label mapping for FEC 11.1.1.0/24 to Switch C.
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