60
round-trip min/avg/max/std-dev = 1.000/1.400/2.000/0.490 ms
163BIPv6 label advertisement control configuration example
363BNetwork requirements
Two links, Switch A—Switch B—Switch C and Switch A—Switch D—Switch C, exist between
subnets 11::0/64 and 21::0/64.
Configure LDP to establish LSPs only for routes to subnets 11::0/64 and 21::0/64.
Configure LDP to establish LSPs only on the link Switch A—Switch B—Switch C to forward traffic
between subnets 11::0/64 and 21::0/64.
Figure 22 Network diagram
364BRequirements analysis
• To ensure that the LSRs establish IPv6 LSPs automatically, enable IPv6 LDP on each LSR.
• To establish IPv6 LDP LSPs, configure an IPv6 routing protocol to ensure IP connectivity
between the LSRs. This example uses OSPFv3.
• To ensure that LDP establishes IPv6 LSPs only for the routes 11::0/64 and 21::0/64, configure
IPv6 LSP generation policies on each LSR.
• To ensure that LDP establishes IPv6 LSPs only over the link Switch A—Switch B—Switch C,
configure IPv6 label advertisement policies as follows:
{ Switch A advertises only the label mapping for FEC 11::0/64 to Switch B.
{ Switch C advertises only the label mapping for FEC 21::0/64 to Switch B.
{ Switch D does not advertise label mapping for FEC 21::0/64 to Switch A. Switch D does not
advertise label mapping for FEC 11::0/64 to Switch C.
365BConfiguration procedure
Before configuration, disable the spanning tree feature globally or map each VLAN to an MSTI. For
more information, see Layer 2—LAN Switching Configuration Guide.
1. Configure IPv6 addresses and masks for interfaces, including the loopback interfaces, as
shown in
702HFigure 22. (Details not shown.)
2. Configure OSPFv3 on each switch to ensure IP connectivity between them. (Details not
shown.)
Switch A
Switch B
Switch C
Loop0
1.1.1.9/32
100::1/128
Loop0
3.3.3.9/32
100::3/128
Vlan-int2
10::1/64
Vlan-int3
20::1/64
Vlan-int2
10::2/64
Vlan-int3
20::2/64
11::0/64 21::0/64
Vlan-int4
11::1/64
Vlan-int5
21::1/64
Switch D
Loop0
4.4.4.9/32
100::4/128
Loop0
2.2.2.9/32
100::2/128
Vlan-int6
30::1/64
Vlan-int7
40::2/64
Vlan-int6
30::2/64
Vlan-int7
40::1/64
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