OSPF LFA Fast Reroute (FRR)
#OSPF #LFA #Fast Reroute(#FRR)
Output:
in this output we will found some route which indicates (!), it means backup path
RP/0/0/CPU0:R6#show route 5.5.5.5
Thu Jun 6 16:26:59.983 UTC
Routing entry for 5.5.5.5/32
Known via “ospf 1”, distance 110, metric 4, type intra area
Installed Jun 6 16:00:32.102 for 00:26:28
Routing Descriptor Blocks
192.168.16.1, from 5.5.5.5, via GigabitEthernet0/0/0/0, Protected
Route metric is 4
192.168.36.3, from 5.5.5.5, via GigabitEthernet0/0/0/1, Backup
Route metric is 0
No advertising protos.
RP/0/0/CPU0:R6#
#More Output
RP/0/0/CPU0:R6#show route
M – mobile route, r – RPL, (!) – FRR Backup path
Gateway of last resort is not set
O 1.1.1.1/32 [110/2] via 192.168.16.1, 01:06:04, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:06:04, GigabitEthernet0/0/0/1 (!)
O 2.2.2.2/32 [110/3] via 192.168.16.1, 01:06:04, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:06:04, GigabitEthernet0/0/0/1 (!)
O 3.3.3.3/32 [110/3] via 192.168.16.1, 01:06:04, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:06:04, GigabitEthernet0/0/0/1 (!)
O 4.4.4.4/32 [110/4] via 192.168.16.1, 01:01:06, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:01:06, GigabitEthernet0/0/0/1 (!)
O 5.5.5.5/32 [110/4] via 192.168.16.1, 00:22:28, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 00:22:28, GigabitEthernet0/0/0/1 (!)
L 6.6.6.6/32 is directly connected, 01:17:03, Loopback0
O 192.168.12.0/24 [110/2] via 192.168.16.1, 01:06:04, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:06:04, GigabitEthernet0/0/0/1 (!)
O 192.168.13.0/24 [110/2] via 192.168.16.1, 01:06:04, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:06:04, GigabitEthernet0/0/0/1 (!)
C 192.168.16.0/24 is directly connected, 01:16:50, GigabitEthernet0/0/0/0
L 192.168.16.6/32 is directly connected, 01:16:50, GigabitEthernet0/0/0/0
O 192.168.23.0/24 [110/3] via 192.168.16.1, 01:05:38, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:05:38, GigabitEthernet0/0/0/1 (!)
O 192.168.24.0/24 [110/3] via 192.168.16.1, 01:06:04, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:06:04, GigabitEthernet0/0/0/1 (!)
O 192.168.25.0/24 [110/3] via 192.168.16.1, 01:06:04, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:06:04, GigabitEthernet0/0/0/1 (!)
O 192.168.34.0/24 [110/3] via 192.168.16.1, 01:06:04, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 01:06:04, GigabitEthernet0/0/0/1 (!)
C 192.168.36.0/24 is directly connected, 01:16:49, GigabitEthernet0/0/0/1
L 192.168.36.6/32 is directly connected, 01:16:49, GigabitEthernet0/0/0/1
O 192.168.45.0/24 [110/4] via 192.168.16.1, 00:22:22, GigabitEthernet0/0/0/0
[110/0] via 192.168.36.3, 00:22:22, GigabitEthernet0/0/0/1 (!)
Configuration:
R1
configure
hostname R1
interface Loopback0
no shut
ipv4 address 1.1.1.1 255.255.255.255
!
interface GigabitEthernet0/0/0/0
no shut
ipv4 address 192.168.16.1 255.255.255.0
!
interface GigabitEthernet0/0/0/1
no shut
ipv4 address 192.168.12.1 255.255.255.0
!
interface GigabitEthernet0/0/0/2
no shut
ipv4 address 192.168.13.1 255.255.255.0
!
router ospf 1
router-id 1.1.1.1
bfd minimum-interval 300
bfd multiplier 3
mpls ldp auto-config
fast-reroute per-link
address-family ipv4 unicast
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0
bfd fast-detect
!
interface GigabitEthernet0/0/0/1
bfd fast-detect
!
interface GigabitEthernet0/0/0/2
bfd fast-detect
!
mpls ldp
router-id Loopback0
!
commit
R2
configure
hostname R2
interface Loopback0
no shut
ipv4 address 2.2.2.2 255.255.255.255
!
interface GigabitEthernet0/0/0/0
no shut
ipv4 address 192.168.25.2 255.255.255.0
!
interface GigabitEthernet0/0/0/1
no shut
ipv4 address 192.168.12.2 255.255.255.0
!
interface GigabitEthernet0/0/0/2
no shut
ipv4 address 192.168.24.2 255.255.255.0
!
interface GigabitEthernet0/0/0/3
no shut
ipv4 address 192.168.23.2 255.255.255.0
!
router ospf 1
router-id 2.2.2.2
bfd minimum-interval 300
bfd multiplier 3
mpls ldp auto-config
fast-reroute per-link
address-family ipv4 unicast
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0
bfd fast-detect
!
interface GigabitEthernet0/0/0/1
bfd fast-detect
!
interface GigabitEthernet0/0/0/2
bfd fast-detect
!
interface GigabitEthernet0/0/0/3
bfd fast-detect
!
mpls ldp
router-id Loopback0
!
commit
R3
configure
hostname R3
interface Loopback0
no shut
ipv4 address 3.3.3.3 255.255.255.255
!
interface GigabitEthernet0/0/0/0
no shut
ipv4 address 192.168.34.3 255.255.255.0
!
interface GigabitEthernet0/0/0/1
no shut
ipv4 address 192.168.36.3 255.255.255.0
!
interface GigabitEthernet0/0/0/2
no shut
ipv4 address 192.168.13.3 255.255.255.0
!
interface GigabitEthernet0/0/0/3
no shut
ipv4 address 192.168.23.3 255.255.255.0
!
router ospf 1
router-id 3.3.3.3
bfd minimum-interval 300
bfd multiplier 3
mpls ldp auto-config
fast-reroute per-link
address-family ipv4 unicast
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0
bfd fast-detect
!
interface GigabitEthernet0/0/0/1
bfd fast-detect
!
interface GigabitEthernet0/0/0/2
bfd fast-detect
!
interface GigabitEthernet0/0/0/3
bfd fast-detect
!
mpls ldp
router-id Loopback0
!
commit
R4
configure
hostname R4
interface Loopback0
no shut
ipv4 address 4.4.4.4 255.255.255.255
!
interface GigabitEthernet0/0/0/0
no shut
ipv4 address 192.168.34.4 255.255.255.0
!
interface GigabitEthernet0/0/0/1
no shut
ipv4 address 192.168.45.4 255.255.255.0
!
interface GigabitEthernet0/0/0/2
no shut
ipv4 address 192.168.24.4 255.255.255.0
router ospf 1
router-id 4.4.4.4
bfd minimum-interval 300
bfd multiplier 3
mpls ldp auto-config
fast-reroute per-link
address-family ipv4 unicast
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0
bfd fast-detect
!
interface GigabitEthernet0/0/0/1
bfd fast-detect
!
interface GigabitEthernet0/0/0/2
bfd fast-detect
!
mpls ldp
router-id Loopback0
!
commit
R5
configure
hostname R5
interface Loopback0
no shut
ipv4 address 5.5.5.5 255.255.255.255
!
interface GigabitEthernet0/0/0/0
no shut
ipv4 address 192.168.25.5 255.255.255.0
!
interface GigabitEthernet0/0/0/1
no shut
ipv4 address 192.168.45.5 255.255.255.0
router ospf 1
router-id 5.5.5.5
bfd minimum-interval 300
bfd multiplier 3
mpls ldp auto-config
fast-reroute per-link
address-family ipv4 unicast
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0
bfd fast-detect
!
interface GigabitEthernet0/0/0/1
bfd fast-detect
!
mpls ldp
router-id Loopback0
!
commit
R6
configure
hostname R6
interface Loopback0
no shut
ipv4 address 6.6.6.6 255.255.255.255
!
interface GigabitEthernet0/0/0/0
no shut
ipv4 address 192.168.16.6 255.255.255.0
!
interface GigabitEthernet0/0/0/1
no shut
ipv4 address 192.168.36.6 255.255.255.0
router ospf 1
router-id 6.6.6.6
bfd minimum-interval 300
bfd multiplier 3
mpls ldp auto-config
fast-reroute per-link
address-family ipv4 unicast
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0
bfd fast-detect
!
interface GigabitEthernet0/0/0/1
bfd fast-detect
!
mpls ldp
router-id Loopback0
!
commit
