H3C Technologies H3C S6800 Series Switches - Manual (Page 63)

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Figure 20 Network diagram
Requirements analysis
• To ensure that the LSRs establish LSPs automatically, enable LDP on each LSR.
• To establish LDP LSPs, configure a routing protocol to ensure IP connectivity between the LSRs. This
example uses OSPF.
• To ensure that LDP establishes LSPs only for the routes 11.1.1.0/24 and 21.1.1.0/24, configure LSP
generation policies on each LSR.
• To allow LDP to establish backup LSRs, configure OSPF FRR on Switch S and Switch D.
Configuration procedure
1. Configure IP addresses and masks for interfaces, including the loopback interfaces, as shown
in Figure 20 . (Details not shown.)
2. Configure OSPF on each switch to ensure IP connectivity between them. (Details not shown.)
3. Configure OSPF FRR by using one of the following methods:
{
(Method 1.) Enable OSPF FRR to calculate a backup next hop by using the LFA algorithm:
# Configure Switch S.
<SwitchS> system-view
[SwitchS] bfd echo-source-ip 10.10.10.10
[SwitchS] ospf 1
[SwitchS-ospf-1] fast-reroute lfa
[SwitchS-ospf-1] quit
# Configure Switch D.
<SwitchD> system-view
[SwitchD] bfd echo-source-ip 11.11.11.11
[SwitchD] ospf 1
[SwitchD-ospf-1] fast-reroute lfa
[SwitchD-ospf-1] quit
{
(Method 2.) Enable OSPF FRR to specify a backup next hop by using a routing policy:
# Configure Switch S.
<SwitchS> system-view
[SwitchS] bfd echo-source-ip 10.10.10.10