In
the below scenario, we will establish MPLS L3VPN using BGP as the PE-CE routing
protocol, we will examine PIC on both address families: IPv4 and VPNv4
R1#show
ip bgp
BGP
table version is 3, local router ID is 1.1.1.1
Status
codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m
multipath, b backup-path, f RT-Filter,
x best-external, a
additional-path, c RIB-compressed,
Origin
codes: i - IGP, e - EGP, ? - incomplete
RPKI
validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*>
1.1.1.1/32 0.0.0.0 0 32768 i
*>
5.5.5.5/32 192.168.12.2 0 2 5 i
R1#ping
5.5.5.5 source lo0
Type
escape sequence to abort.
Sending
5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:
Packet
sent with a source address of 1.1.1.1
!!!!!
Success
rate is 100 percent (5/5), round-trip min/avg/max = 540/608/688 ms
R5#ping
1.1.1.1 source lo0
Type
escape sequence to abort.
Sending
5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet
sent with a source address of 5.5.5.5
!!!!!
Success
rate is 100 percent (5/5), round-trip min/avg/max = 488/553/624 ms
R5#show
ip bgp 1.1.1.1 255.255.255.255
BGP
routing table entry for 1.1.1.1/32, version 6
Paths:
(2 available, best #2, table default)
Advertised to update-groups:
1
Refresh Epoch 1
2 1
192.168.45.4 from 192.168.45.4 (4.4.4.4)
Origin IGP, localpref 100, valid,
external
rx pathid: 0, tx pathid: 0
Refresh Epoch 1
2 1
192.168.35.3 from 192.168.35.3 (3.3.3.3)
Origin IGP, localpref 100, valid,
external, best
rx pathid: 0, tx pathid: 0x0
R5#show
ip cef 1.1.1.1 255.255.255.255 detail
1.1.1.1/32,
epoch 0, flags rib only nolabel, rib defined all labels
recursive via 192.168.35.3
attached to FastEthernet1/0
R2#show
bgp vpnv4 unicast all
BGP
table version is 10, local router ID is 2.2.2.2
Status
codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m
multipath, b backup-path, f RT-Filter,
x best-external, a
additional-path, c RIB-compressed,
Origin
codes: i - IGP, e - EGP, ? - incomplete
RPKI
validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
Route
Distinguisher: 1:1 (default for vrf mssk)
*>
1.1.1.1/32 192.168.12.1 0 0 1 i
* i 5.5.5.5/32 4.4.4.4 0 100
0 5 i
*>i 3.3.3.3 0 100
0 5 i
R2#show
bgp vpnv4 unicast all 5.5.5.5 255.255.255.255
BGP
routing table entry for 1:1:5.5.5.5/32, version 10
Paths:
(2 available, best #2, table mssk)
Advertised to update-groups:
1
Refresh Epoch 1
5
4.4.4.4 (metric 2) from 4.4.4.4 (4.4.4.4)
Origin IGP, metric 0, localpref 100,
valid, internal
Extended Community: RT:1:1
mpls labels in/out nolabel/19
rx pathid: 0, tx pathid: 0
Refresh Epoch 1
5
3.3.3.3 (metric 2) from 3.3.3.3 (3.3.3.3)
Origin IGP, metric 0, localpref 100,
valid, internal, best
Extended Community: RT:1:1
mpls labels in/out nolabel/18
rx pathid: 0, tx pathid: 0x0
R2#sh
ip cef vrf mssk 5.5.5.5/32 detail
5.5.5.5/32,
epoch 0, flags rib defined all labels
recursive via 3.3.3.3 label 18
nexthop 192.168.23.3 FastEthernet1/1
Now,
let us enable PIC on R5 under the IPv4 address-family
R5
R5(config)#router
bgp 5
R5(config-router)#address-family
ipv4 unicast
R5(config-router-af)#bgp
additional-paths install
R5#show
ip bgp
BGP
table version is 9, local router ID is 5.5.5.5
Status
codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m
multipath, b backup-path, f RT-Filter,
x best-external, a
additional-path, c RIB-compressed,
Origin
codes: i - IGP, e - EGP, ? - incomplete
RPKI
validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*b 1.1.1.1/32 192.168.45.4 0 2 1 i
*> 192.168.35.3 0 2 1 i
*>
5.5.5.5/32 0.0.0.0 0
32768 i
R5#show
ip bgp 1.1.1.1 255.255.255.255
BGP
routing table entry for 1.1.1.1/32, version 8
Paths:
(2 available, best #2, table default)
Additional-path-install
Advertised to update-groups:
1
Refresh Epoch 1
2 1
192.168.45.4 from 192.168.45.4 (4.4.4.4)
Origin IGP, localpref 100, valid,
external, backup/repair, recursive-via-connected
rx pathid: 0, tx pathid: 0
Refresh Epoch 1
2 1
192.168.35.3 from 192.168.35.3 (3.3.3.3)
Origin IGP, localpref 100, valid,
external, best , recursive-via-connected
rx pathid: 0, tx pathid: 0x0
R5#show
ip cef 1.1.1.1 255.255.255.255 detail
1.1.1.1/32,
epoch 0, flags rib only nolabel, rib defined all labels
recursive via 192.168.35.3
attached to FastEthernet1/0
recursive via 192.168.45.4, repair
attached to FastEthernet1/1
Now,
we will enable PIC on R2 under the VPNv4 address-family
R2
R2(config)#router
bgp 2
R2(config-router)#address-family
vpnv4 unicast
R2(config-router-af)#bgp
additional-paths install
R2#show
bgp vpnv4 unicast all
BGP
table version is 12, local router ID is 2.2.2.2
Status
codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m
multipath, b backup-path, f RT-Filter,
x best-external, a
additional-path, c RIB-compressed,
Origin
codes: i - IGP, e - EGP, ? - incomplete
RPKI
validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
Route
Distinguisher: 1:1 (default for vrf mssk)
*>
1.1.1.1/32 192.168.12.1 0 0 1 i
*bi
5.5.5.5/32 4.4.4.4 0 100
0 5 i
*>i 3.3.3.3 0 100
0 5 i
R2#show
bgp vpnv4 unicast all 5.5.5.5 255.255.255.255
BGP
routing table entry for 1:1:5.5.5.5/32, version 12
Paths:
(2 available, best #2, table mssk)
Additional-path-install
Advertised to update-groups:
1
Refresh Epoch 1
5
4.4.4.4 (metric 2) from 4.4.4.4 (4.4.4.4)
Origin IGP, metric 0, localpref 100,
valid, internal, backup/repair
Extended Community: RT:1:1 ,
recursive-via-host
mpls labels in/out nolabel/19
rx pathid: 0, tx pathid: 0
Refresh Epoch 1
5
3.3.3.3 (metric 2) from 3.3.3.3 (3.3.3.3)
Origin IGP, metric 0, localpref 100,
valid, internal, best
Extended Community: RT:1:1 ,
recursive-via-host
mpls labels in/out nolabel/18
rx pathid: 0, tx pathid: 0x0
R2#sh
ip cef vrf mssk 5.5.5.5/32 detail
5.5.5.5/32,
epoch 0, flags rib defined all labels
recursive via 3.3.3.3 label 18
nexthop 192.168.23.3 FastEthernet1/1
recursive via 4.4.4.4 label 19, repair
nexthop 192.168.24.4 FastEthernet2/0 
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