Topology:
Use configuration from L3VPN task #6 as initial configuration for this task.
Requirements:
1. Service Providers X and Y are expecting a large amount of L3VPN customers to be connected in the future, similar to Customer A (Inter-AS L3VPN). Change the solution to improve the scalability and reduce the provisioning overhead.
2. Customer's traffic should be labeled "end-to-end".
3. Service Providers has agreed to coordinate the route-target values. For Customer A, use route-target 10:10.
4. In order to reduce downtime, configuration change shall affect the minimal number of devices.
Solution:
Highlight the text below to reveal the solution.
This task requires understanding of Inter-AS L3VPN configuration Options 10B and 10C.
Requirements #1, 2 and 3 can be satisfied with either option 10B or option 10C configuration. Both options 10B and 10C improve the scalability and reduce the configuration overhead, since there is no need to configure a dedicated connection on ASBR for each VFR that requires Inter-AS service. Both results in "end-to-end" LSP for customers traffic.
Requirement #4 - implementing option 10B only requires to update the configuration on ASBR routers, and change the route-target value on R6. option 10C would require also to alter the configuration of Route-reflector routers R2 and R5.
Note:
* In IOS, there are two options to implement the Option 10B configuration on ASBR.
First option is to use "next-hop-self" on VPNv4 iBGP sessions.
Second option is to configure "redistribute connected" into the IGP. This will result in allocating a label for VPNv4 eBGP peer, because host route to the peer is automatically created once session is established. This solution uses the second option.
* In IOS-XR, the only option is to configure "next-hop-self" on VPNv4 iBGP sessions. In addition, on ASBR, you must configure a static host route towards the neighbor eBGP peer address.
!
router static
address-family ipv4 unicast
19.0.34.4/32 GigabitEthernet0/0/0/2
!
!
!
router isis AS20
mpls ldp autoconfig
net 49.0020.0000.0000.0007.00
is-type level-2-only
redistribute connected
!
router bgp 20
bgp log-neighbor-changes
no bgp default ipv4-unicast
no bgp default route-target filter
neighbor 20.0.5.5 remote-as 20
neighbor 20.0.5.5 update-source Loopback0
neighbor 20.0.79.9 remote-as 19
!
address-family ipv4
exit-address-family
!
address-family vpnv4
neighbor 20.0.5.5 activate
neighbor 20.0.5.5 send-community both
neighbor 20.0.79.9 activate
neighbor 20.0.79.9 send-community both
exit-address-family
!
This task requires understanding of Inter-AS L3VPN configuration Options 10B and 10C.
Requirements #1, 2 and 3 can be satisfied with either option 10B or option 10C configuration. Both options 10B and 10C improve the scalability and reduce the configuration overhead, since there is no need to configure a dedicated connection on ASBR for each VFR that requires Inter-AS service. Both results in "end-to-end" LSP for customers traffic.
Requirement #4 - implementing option 10B only requires to update the configuration on ASBR routers, and change the route-target value on R6. option 10C would require also to alter the configuration of Route-reflector routers R2 and R5.
Note:
* In IOS, there are two options to implement the Option 10B configuration on ASBR.
First option is to use "next-hop-self" on VPNv4 iBGP sessions.
Second option is to configure "redistribute connected" into the IGP. This will result in allocating a label for VPNv4 eBGP peer, because host route to the peer is automatically created once session is established. This solution uses the second option.
* In IOS-XR, the only option is to configure "next-hop-self" on VPNv4 iBGP sessions. In addition, on ASBR, you must configure a static host route towards the neighbor eBGP peer address.
R3:
!
router static
address-family ipv4 unicast
19.0.34.4/32 GigabitEthernet0/0/0/2
!
!
router bgp 19
address-family vpnv4 unicast
retain route-target all
!
neighbor 19.0.2.2
remote-as 19
update-source Loopback0
address-family vpnv4 unicast
next-hop-self
!
!
neighbor 19.0.34.4
remote-as 20
address-family vpnv4 unicast
route-policy ANY in
route-policy ANY out
!
!
!
R4:
router static
address-family ipv4 unicast
19.0.34.3/32 GigabitEthernet0/0/0/2
!
!
router bgp 20
address-family vpnv4 unicast
retain route-target all
!
neighbor 20.0.5.5
remote-as 20
update-source Loopback0
address-family vpnv4 unicast
route-policy HIGH_LP out
next-hop-self
!
!
neighbor 19.0.34.3
remote-as 19
address-family vpnv4 unicast
route-policy ANY in
route-policy ANY out
!
!
!
R7:
!
router isis AS20
mpls ldp autoconfig
net 49.0020.0000.0000.0007.00
is-type level-2-only
redistribute connected
!
router bgp 20
bgp log-neighbor-changes
no bgp default ipv4-unicast
no bgp default route-target filter
neighbor 20.0.5.5 remote-as 20
neighbor 20.0.5.5 update-source Loopback0
neighbor 20.0.79.9 remote-as 19
!
address-family ipv4
exit-address-family
!
address-family vpnv4
neighbor 20.0.5.5 activate
neighbor 20.0.5.5 send-community both
neighbor 20.0.79.9 activate
neighbor 20.0.79.9 send-community both
exit-address-family
!
R9:
!
router ospf 1
mpls ldp autoconfig
router-id 19.0.9.9
redistribute connected subnets
!
router bgp 19
bgp log-neighbor-changes
no bgp default ipv4-unicast
no bgp default route-target filter
neighbor 19.0.2.2 remote-as 19
neighbor 19.0.2.2 update-source Loopback0
neighbor 20.0.79.7 remote-as 20
!
address-family ipv4
exit-address-family
!
address-family vpnv4
neighbor 19.0.2.2 activate
neighbor 19.0.2.2 send-community both
neighbor 19.0.2.2 route-map HIGH_LP out
neighbor 20.0.79.7 activate
neighbor 20.0.79.7 send-community both
exit-address-family
!
Verification:
R10#traceroute 10.10.11.11 source lo0
Type escape sequence to abort.
Tracing the route to 10.10.11.11
VRF info: (vrf in name/id, vrf out name/id)
1 19.0.10.1 6 msec 4 msec 4 msec
2 19.0.12.2 [MPLS: Labels 20/22 Exp 0] 2 msec 2 msec 1 msec
3 19.0.29.9 [MPLS: Labels 23/22 Exp 0] 1 msec 1 msec 1 msec
4 20.0.79.7 [MPLS: Label 22 Exp 0] 1 msec 1 msec 1 msec
5 20.0.57.5 [MPLS: Labels 17/21 Exp 0] 2 msec 2 msec 1 msec
6 20.0.11.6 [MPLS: Label 21 Exp 0] 1 msec 2 msec 2 msec
7 20.0.11.11 1 msec 2 msec 2 msec
R11#traceroute 10.10.10.10 source lo0
Type escape sequence to abort.
Tracing the route to 10.10.10.10
VRF info: (vrf in name/id, vrf out name/id)
1 20.0.11.6 5 msec 5 msec 4 msec
2 20.0.56.5 [MPLS: Labels 16/16008 Exp 0] 2 msec 2 msec 2 msec
3 20.0.45.4 [MPLS: Label 16008 Exp 0] 2 msec 2 msec 1 msec
4 19.0.34.3 [MPLS: Label 16008 Exp 0] 1 msec 2 msec 1 msec
5 19.0.23.2 [MPLS: Labels 18/21 Exp 0] 2 msec 2 msec 1 msec
6 19.0.10.1 [MPLS: Label 21 Exp 0] 1 msec 2 msec 1 msec
7 19.0.10.10 2 msec 2 msec 1 msec
R1#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 16 19.0.9.9/32 0 Et0/0 19.0.12.2
17 17 19.0.3.3/32 0 Et0/0 19.0.12.2
18 Pop Label 19.0.2.2/32 0 Et0/0 19.0.12.2
19 Pop Label 19.0.29.0/24 0 Et0/0 19.0.12.2
20 Pop Label 19.0.23.0/24 0 Et0/0 19.0.12.2
21 No Label 10.10.10.0/24[V] 365400 Et1/0 19.0.10.10
22 No Label 19.0.10.0/24[V] 231436 aggregate/CUST_A
23 19 20.0.79.0/24 0 Et0/0 19.0.12.2
24 20 20.0.79.7/32 0 Et0/0 19.0.12.2
25 21 19.0.34.0/24 0 Et0/0 19.0.12.2
R9# show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 17 19.0.3.3/32 0 Et0/0 19.0.29.2
17 Pop Label 19.0.2.2/32 0 Et0/0 19.0.29.2
18 Pop Label 19.0.23.0/24 0 Et0/0 19.0.29.2
19 Pop Label 19.0.12.0/24 0 Et0/0 19.0.29.2
20 18 19.0.1.1/32 0 Et0/0 19.0.29.2
21 21 10:10:10.10.10.0/24 \
43654 Et0/0 19.0.29.2
22 22 10:10:19.0.10.0/24 \
194886 Et0/0 19.0.29.2
23 Pop Label 20.0.79.7/32 29624 Et1/0.11 20.0.79.7
24 22 10:10:10.10.11.0/24 \
24618 Et1/0.11 20.0.79.7
25 23 10:10:20.0.11.0/24 \
0 Et1/0.11 20.0.79.7
26 21 19.0.34.0/24 0 Et0/0 19.0.29.2
R7# show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 Pop Label 20.0.5.5/32 0 Et0/0 20.0.57.5
17 17 20.0.6.6/32 0 Et0/0 20.0.57.5
18 Pop Label 20.0.45.0/24 0 Et0/0 20.0.57.5
19 Pop Label 20.0.56.0/24 0 Et0/0 20.0.57.5
20 16 20.0.4.4/32 0 Et0/0 20.0.57.5
21 Pop Label 20.0.79.9/32 38546 Et1/0.11 20.0.79.9
22 21 10:10:10.10.11.0/24 \
58762 Et0/0 20.0.57.5
23 22 10:10:20.0.11.0/24 \
0 Et0/0 20.0.57.5
24 16008 10:10:10.10.10.0/24 \
0 Et0/0 20.0.57.5
25 16010 10:10:19.0.10.0/24 \
0 Et0/0 20.0.57.5
26 21 19.0.34.0/24 0 Et0/0 20.0.57.5
