Generic Commands
7450 ESS MPLS Guide Page 653
Note that because LDP can detect the loss of a neighbor/next-hop independently, it is possible that it
switches to the LFA next-hop while IGP is still using the primary next-hop. Also, when the interface
for the previous primary next-hop is restored, IGP may re-converge before LDP completed the FEC
exchange with it neighbor over that interface. This may cause LDP to de-program the LFA next-hop
from the FEC and blackhole traffic. In order to avoid this situation, it is recommended to enable IGP-
LDP synchronization on the LDP interface.
When the SPF computation determines there is more than one primary next-hop for a prefix, it will
not program any LFA next-hop in RTM. Thus, the LDP FEC will resolve to the multiple primary
next-hops that provide the required protection.
The no form of this command disables LDP FRR.
Default no fast-reroute
fec-originate
Syntax fec-originate ip-prefix/mask [advertised-label in-label] [swap-label out-label] interface
interface-name
fec-originate ip-prefix/mask [advertised-label in-label] next-hop ip-address [swap-label
out-label]
fec-originate ip-prefix/mask [advertised-label in-label] next-hop ip-address [swap-label
out-label] interface interface-name
fec-originate ip-prefix/mask [advertised-label in-label] pop
no fec-originate ip-prefix/mask interface interface-name
no fec-originate ip-prefix/mask next-hop ip-address
no fec-originate ip-prefix/mask next-hop ip-address interface interface-name
no fec-originate ip-prefix/mask pop
Context config>router>ldp
Description This command defines a way to originate a FEC (with a swap action) for which the LSR is not egress,
or to originate a FEC (with a pop action) for which the LSR is egress.
Parameters ip-prefix/mask — Specify information for the specified IP prefix and mask length.
Values <ip-address/mask> ipv4-prefix - a.b.c.d
ipv4-prefix-le - [0..32]
ipv6-prefix x:x:x:x:x:x:x:x (eight 16-bit pieces)
x:x:x:x:x:x:d.d.d.d
x - [0..FFFF]H
d - [0..255]D
ipv6-prefix-le - [0..128]
next-hop — Specify the IP address of the next hop of the prefix.
advertised-label —
Specify the label advertised to the upstream peer. If not configured, then the
label advertised should be from the label pool. If the configured static label is not available then
the IP prefix is not advertised.
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