Topology:
Configure loopback0 interfaces and links between routers for initial configuration.
AS23 is the service provider, offering L3VPN and MVPN service.
Routers R6, R7 and R8 are Customer-A routers, interconnected via AS23.
Requirements:
1. Configure AS23 network:
1.1 Use single area OSPF ( area 0 ).
1.2 Minimize the amount of iBGP sessions, but ensure redundancy in case of router failure.
2. Configure unicast L3VPN service for Customer-A
2.1 each customer site is allocated a /24 prefix according to topology diagram.
2.2 use static routing to provide unicast connectivity between customer sites.
3. Configure MVPN service for Customer-A
3.1 AS23 shall use multicast group 239.0.1.1 to transport Customer-A multicast traffic.
3.2 AS23 configuration shall provide redundancy for case of router failure
3.2 only use PIM-SM
3.3 only use standards-based protocol to distribute RP information when required
To test the configuration, subscribe to multicast group 239.10.10.10 on R7 loopback0 and R8 loopback0 interfaces. Send multicast traffic from R6 loopback0 interfaces. Verify that both R7 and R8 receive the traffic.
Solution:
Highlight the text below to reveal the solution.
This task requires understanding of MVPN configuration (Draft-Rosen).
For this task, only default MDT is required.
Requirement #1 - Configure two route-reflectors in order to minimize the amount of iBGP sessions and provide redundancy. Note that two route-reflectors must have different cluster- id.
Requirement #3 - Configure MVPN with default MDT group only, as no switching to data MDT is required. Use BSR to distribute RP information both in AS23 and in Customer A networks. In AS23, configure two RP candidates and two BSR candidates to provide redundancy.
!
vrf definition CUST_A
rd 100:100
route-target export 100:100
route-target import 100:100
!
address-family ipv4
mdt default 239.0.1.1
exit-address-family
!
This task requires understanding of MVPN configuration (Draft-Rosen).
For this task, only default MDT is required.
Requirement #1 - Configure two route-reflectors in order to minimize the amount of iBGP sessions and provide redundancy. Note that two route-reflectors must have different cluster- id.
Requirement #3 - Configure MVPN with default MDT group only, as no switching to data MDT is required. Use BSR to distribute RP information both in AS23 and in Customer A networks. In AS23, configure two RP candidates and two BSR candidates to provide redundancy.
R1:
!
vrf definition CUST_A
rd 100:100
route-target export 100:100
route-target import 100:100
!
address-family ipv4
mdt default 239.0.1.1
exit-address-family
!
ip multicast-routing
ip multicast-routing vrf CUST_A
!
!
interface Loopback0
ip address 23.0.1.1 255.255.255.255
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/0
ip address 23.0.15.1 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/1
ip address 23.0.13.1 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/2
ip address 23.0.12.1 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/3
ip address 23.0.14.1 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet1/0
vrf forwarding CUST_A
ip address 23.0.16.1 255.255.255.0
ip pim sparse-mode
!
!
router ospf 1
mpls ldp autoconfig
router-id 23.0.1.1
!
router bgp 23
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 23.0.3.3 remote-as 23
neighbor 23.0.3.3 update-source Loopback0
neighbor 23.0.5.5 remote-as 23
neighbor 23.0.5.5 update-source Loopback0
!
address-family ipv4
exit-address-family
!
address-family vpnv4
neighbor 23.0.3.3 activate
neighbor 23.0.3.3 send-community both
neighbor 23.0.5.5 activate
neighbor 23.0.5.5 send-community both
exit-address-family
!
address-family ipv4 vrf CUST_A
redistribute connected
redistribute static
exit-address-family
!
ip route vrf CUST_A 10.0.6.0 255.255.255.0 23.0.16.6
!
R2:
!
vrf definition CUST_A
rd 100:100
route-target export 100:100
route-target import 100:100
!
address-family ipv4
mdt default 239.0.1.1
exit-address-family
!
ip multicast-routing
ip multicast-routing vrf CUST_A
!
!
interface Loopback0
ip address 23.0.2.2 255.255.255.255
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/0
ip address 23.0.25.2 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/1
ip address 23.0.23.2 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/2
ip address 23.0.12.2 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/3
ip address 23.0.24.2 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet1/0
vrf forwarding CUST_A
ip address 23.0.27.2 255.255.255.0
ip pim sparse-mode
!
!
router ospf 1
mpls ldp autoconfig
router-id 23.0.2.2
!
router bgp 23
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 23.0.3.3 remote-as 23
neighbor 23.0.3.3 update-source Loopback0
neighbor 23.0.5.5 remote-as 23
neighbor 23.0.5.5 update-source Loopback0
!
address-family ipv4
exit-address-family
!
address-family vpnv4
neighbor 23.0.3.3 activate
neighbor 23.0.3.3 send-community both
neighbor 23.0.5.5 activate
neighbor 23.0.5.5 send-community both
exit-address-family
!
address-family ipv4 mdt
neighbor 23.0.3.3 activate
neighbor 23.0.3.3 send-community extended
neighbor 23.0.5.5 activate
neighbor 23.0.5.5 send-community extended
exit-address-family
!
address-family ipv4 vrf CUST_A
redistribute connected
redistribute static
exit-address-family
!
ip route vrf CUST_A 10.0.7.0 255.255.255.0 23.0.27.7
!
R3:
!
interface Loopback0
ipv4 address 23.0.3.3 255.255.255.255
!
!
interface GigabitEthernet0/0/0/0
ipv4 address 23.0.35.3 255.255.255.0
!
interface GigabitEthernet0/0/0/1
ipv4 address 23.0.13.3 255.255.255.0
!
interface GigabitEthernet0/0/0/2
ipv4 address 23.0.23.3 255.255.255.0
!
interface GigabitEthernet0/0/0/3
ipv4 address 23.0.34.3 255.255.255.0
!
!
router ospf 1
router-id 23.0.3.3
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0
network point-to-point
!
interface GigabitEthernet0/0/0/1
network point-to-point
!
interface GigabitEthernet0/0/0/2
network point-to-point
!
interface GigabitEthernet0/0/0/3
network point-to-point
!
!
!
router bgp 23
bgp cluster-id 23.0.3.3
address-family vpnv4 unicast
!
neighbor-group CLIENTS
remote-as 23
update-source Loopback0
address-family vpnv4 unicast
route-reflector-client
!
!
neighbor 23.0.1.1
use neighbor-group CLIENTS
!
neighbor 23.0.2.2
use neighbor-group CLIENTS
!
neighbor 23.0.4.4
use neighbor-group CLIENTS
!
neighbor 23.0.5.5
remote-as 23
update-source Loopback0
address-family vpnv4 unicast
!
!
!
mpls ldp
interface GigabitEthernet0/0/0/0
!
interface GigabitEthernet0/0/0/1
!
interface GigabitEthernet0/0/0/2
!
interface GigabitEthernet0/0/0/3
!
!
multicast-routing
address-family ipv4
interface all enable
!
!
router pim
address-family ipv4
bsr candidate-bsr 23.0.3.3 hash-mask-len 30 priority 1
bsr candidate-rp 23.0.3.3 priority 192 interval 60
!
!
R4:
!
logging console debugging
vrf CUST_A
address-family ipv4 unicast
import route-target
100:100
!
export route-target
100:100
!
!
!
!
interface Loopback0
ipv4 address 23.0.4.4 255.255.255.255
!
!
interface GigabitEthernet0/0/0/0
ipv4 address 23.0.45.4 255.255.255.0
!
interface GigabitEthernet0/0/0/1
ipv4 address 23.0.34.4 255.255.255.0
!
interface GigabitEthernet0/0/0/2
ipv4 address 23.0.14.4 255.255.255.0
!
interface GigabitEthernet0/0/0/3
ipv4 address 23.0.24.4 255.255.255.0
!
interface GigabitEthernet0/0/0/4
vrf CUST_A
ipv4 address 23.0.48.4 255.255.255.0
!
!
router static
vrf CUST_A
address-family ipv4 unicast
10.0.8.0/24 23.0.48.8
!
!
!
router ospf 1
router-id 23.0.4.4
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0
network point-to-point
!
interface GigabitEthernet0/0/0/1
network point-to-point
!
interface GigabitEthernet0/0/0/2
network point-to-point
!
interface GigabitEthernet0/0/0/3
network point-to-point
!
!
!
router bgp 23
address-family vpnv4 unicast
!
neighbor 23.0.3.3
remote-as 23
update-source Loopback0
address-family vpnv4 unicast
!
!
neighbor 23.0.5.5
remote-as 23
update-source Loopback0
address-family vpnv4 unicast
!
!
vrf CUST_A
rd 100:100
address-family ipv4 unicast
redistribute connected
redistribute static
!
!
!
mpls ldp
interface GigabitEthernet0/0/0/0
!
interface GigabitEthernet0/0/0/1
!
interface GigabitEthernet0/0/0/2
!
interface GigabitEthernet0/0/0/3
!
!
multicast-routing
address-family ipv4
mdt source Loopback0
interface all enable
!
vrf CUST_A
address-family ipv4
interface all enable
mdt default ipv4 239.0.1.1
!
!
!
R5:
!
ip multicast-routing
!
!
interface Loopback0
ip address 23.0.5.5 255.255.255.255
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/0
ip address 23.0.35.5 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/1
ip address 23.0.15.5 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/2
ip address 23.0.25.5 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
interface Ethernet0/3
ip address 23.0.45.5 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
ip ospf 1 area 0
!
!
router ospf 1
mpls ldp autoconfig
router-id 23.0.5.5
!
router bgp 23
bgp cluster-id 23.0.5.5
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor CLIENTS peer-group
neighbor CLIENTS remote-as 23
neighbor CLIENTS update-source Loopback0
neighbor 23.0.1.1 peer-group CLIENTS
neighbor 23.0.2.2 peer-group CLIENTS
neighbor 23.0.3.3 remote-as 23
neighbor 23.0.3.3 update-source Loopback0
neighbor 23.0.4.4 peer-group CLIENTS
!
address-family ipv4
exit-address-family
!
address-family vpnv4
neighbor CLIENTS send-community both
neighbor CLIENTS route-reflector-client
neighbor 23.0.1.1 activate
neighbor 23.0.2.2 activate
neighbor 23.0.3.3 activate
neighbor 23.0.3.3 send-community both
neighbor 23.0.4.4 activate
exit-address-family
!
R6:
!
ip multicast-routing
!
!
interface Loopback0
ip address 10.0.6.6 255.255.255.255
ip pim sparse-mode
!
interface Ethernet0/0
ip address 23.0.16.6 255.255.255.0
ip pim sparse-mode
!
ip pim bsr-candidate Loopback0 0
ip pim rp-candidate Loopback0
ip route 0.0.0.0 0.0.0.0 23.0.16.1
!
R7:
ip multicast-routing
!
interface Loopback0
ip address 10.0.7.7 255.255.255.255
ip pim sparse-mode
ip igmp join-group 239.10.10.10
!
interface Ethernet0/0
ip address 23.0.27.7 255.255.255.0
ip pim sparse-mode
!
ip route 0.0.0.0 0.0.0.0 23.0.27.2
R8:
ip multicast-routing
!
!
interface Loopback0
ip address 10.0.8.8 255.255.255.255
ip pim sparse-mode
ip igmp join-group 239.10.10.10
!
interface Ethernet0/0
ip address 23.0.48.8 255.255.255.0
ip pim sparse-mode
!
ip route 0.0.0.0 0.0.0.0 23.0.48.4
!
Verification:
R1#sh ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
23.0.15.5 Ethernet0/0 05:20:27/00:01:33 v2 1 / DR S P G
23.0.13.3 Ethernet0/1 05:16:59/00:01:26 v2 1 / DR G
23.0.12.2 Ethernet0/2 04:54:07/00:01:20 v2 1 / DR S P G
23.0.14.4 Ethernet0/3 05:16:27/00:01:21 v2 1 / DR G
R1#sh ip pim rp mapping
PIM Group-to-RP Mappings
Group(s) 224.0.0.0/4
RP 23.0.5.5 (?), v2
Info source: 23.0.3.3 (?), via bootstrap, priority 0, holdtime 150
Uptime: 04:43:23, expires: 00:02:06
RP 23.0.3.3 (?), v2
Info source: 23.0.3.3 (?), via bootstrap, priority 192, holdtime 150
Uptime: 04:46:38, expires: 00:02:07
R1# show ip pim vrf CUST_A neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
23.0.4.4 Tunnel1 04:37:13/00:01:23 v2 1 / DR G
23.0.2.2 Tunnel1 04:51:34/00:01:37 v2 1 / S P G
23.0.16.6 Ethernet1/0 05:03:06/00:01:44 v2 1 / DR S P G
R1#sh ip pim vrf CUST_A rp mapping
PIM Group-to-RP Mappings
Group(s) 224.0.0.0/4
RP 10.0.6.6 (?), v2
Info source: 10.0.6.6 (?), via bootstrap, priority 0, holdtime 150
Uptime: 04:42:23, expires: 00:01:51
R2# sh ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
23.0.25.5 Ethernet0/0 04:55:29/00:01:21 v2 1 / DR S P G
23.0.23.3 Ethernet0/1 04:55:56/00:01:37 v2 1 / DR G
23.0.12.1 Ethernet0/2 04:55:29/00:01:34 v2 1 / S P G
23.0.24.4 Ethernet0/3 04:55:58/00:01:26 v2 1 / DR G
R2#sh ip pim vrf CUST_A neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
23.0.27.7 Ethernet1/0 04:55:34/00:01:36 v2 1 / DR S P G
23.0.4.4 Tunnel0 04:39:43/00:01:24 v2 1 / DR G
23.0.1.1 Tunnel0 04:49:38/00:01:44 v2 1 / S P G
RP/0/0/CPU0:ios# show pim interface
Mon Jan 18 18:02:44.871 UTC
PIM interfaces in VRF default
Address Interface PIM Nbr Hello DR DR
Count Intvl Prior
23.0.4.4 Loopback0 on 1 30 1 this system
23.0.45.4 GigabitEthernet0/0/0/0 on 2 30 1 23.0.45.5
23.0.34.4 GigabitEthernet0/0/0/1 on 2 30 1 this system
23.0.14.4 GigabitEthernet0/0/0/2 on 2 30 1 this system
23.0.24.4 GigabitEthernet0/0/0/3 on 2 30 1 this system
RP/0/0/CPU0:ios#show pim rp mapping
Mon Jan 18 18:02:49.151 UTC
PIM Group-to-RP Mappings
Group(s) 224.0.0.0/4
RP 23.0.5.5 (?), v2
Info source: 23.0.34.3 (?), elected via bsr, priority 0, holdtime 150
Uptime: 04:53:16, expires: 00:01:49
Group(s) 224.0.0.0/4
RP 23.0.3.3 (?), v2
Info source: 23.0.34.3 (?), elected via bsr, priority 192, holdtime 150
Uptime: 04:51:59, expires: 00:01:49
RP/0/0/CPU0:ios#show pim vrf CUST_A interface
Mon Jan 18 18:02:55.390 UTC
PIM interfaces in VRF CUST_A
Address Interface PIM Nbr Hello DR DR
Count Intvl Prior
23.0.4.4 mdtCUST/A on 3 30 1 this system
23.0.48.4 GigabitEthernet0/0/0/4 on 2 30 1 23.0.48.8
RP/0/0/CPU0:ios#show pim neighbor
Mon Jan 18 18:02:59.230 UTC
PIM neighbors in VRF default
Flag: B - Bidir capable, P - Proxy capable, DR - Designated Router,
E - ECMP Redirect capable
* indicates the neighbor created for this router
Neighbor Address Interface Uptime Expires DR pri Flags
23.0.45.4* GigabitEthernet0/0/0/0 05:22:05 00:01:34 1 B E
23.0.45.5 GigabitEthernet0/0/0/0 05:21:59 00:01:42 1 (DR) P
23.0.34.3 GigabitEthernet0/0/0/1 05:22:00 00:01:19 1 B
23.0.34.4* GigabitEthernet0/0/0/1 05:22:05 00:01:23 1 (DR) B E
23.0.14.1 GigabitEthernet0/0/0/2 05:22:02 00:01:21 1 P
23.0.14.4* GigabitEthernet0/0/0/2 05:22:05 00:01:18 1 (DR) B E
23.0.24.2 GigabitEthernet0/0/0/3 05:22:00 00:01:17 1 P
23.0.24.4* GigabitEthernet0/0/0/3 05:22:05 00:01:44 1 (DR) B E
23.0.4.4* Loopback0 05:22:05 00:01:24 1 (DR) B E
PIM neighbors in VRF CUST_A
Flag: B - Bidir capable, P - Proxy capable, DR - Designated Router,
E - ECMP Redirect capable
* indicates the neighbor created for this router
Neighbor Address Interface Uptime Expires DR pri Flags
23.0.48.4* GigabitEthernet0/0/0/4 04:44:57 00:01:32 1 B E
23.0.48.8 GigabitEthernet0/0/0/4 04:44:54 00:01:18 1 (DR) P
23.0.1.1 mdtCUST/A 04:43:39 00:01:18 1 P
23.0.2.2 mdtCUST/A 04:43:35 00:01:40 1 P
23.0.4.4* mdtCUST/A 04:43:40 00:01:33 1 (DR)
RP/0/0/CPU0:ios#show pim vrf CUST_A rp mapping
Mon Jan 18 18:03:20.298 UTC
PIM Group-to-RP Mappings
Group(s) 224.0.0.0/4
RP 10.0.6.6 (?), v2
Info source: 23.0.1.1 (?), elected via bsr, priority 0, holdtime 150
Uptime: 04:43:30, expires: 00:01:48
R6#sh ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
23.0.16.1 Ethernet0/0 05:14:46/00:01:25 v2 1 / S P G
R6#ping 239.10.10.10 source lo0 repeat 4
Type escape sequence to abort.
Sending 4, 100-byte ICMP Echos to 239.10.10.10, timeout is 2 seconds:
Packet sent with a source address of 10.0.6.6
Reply to request 0 from 10.0.7.7, 6 ms
Reply to request 0 from 10.0.8.8, 19 ms
Reply to request 0 from 10.0.8.8, 16 ms
Reply to request 0 from 10.0.7.7, 12 ms
Reply to request 1 from 10.0.7.7, 2 ms
Reply to request 1 from 10.0.8.8, 6 ms
Reply to request 1 from 10.0.8.8, 6 ms
Reply to request 1 from 10.0.7.7, 2 ms
Reply to request 2 from 10.0.7.7, 2 ms
Reply to request 2 from 10.0.8.8, 6 ms
Reply to request 2 from 10.0.8.8, 5 ms
Reply to request 2 from 10.0.7.7, 3 ms
Reply to request 3 from 10.0.7.7, 3 ms
Reply to request 3 from 10.0.8.8, 7 ms
Reply to request 3 from 10.0.8.8, 6 ms
Reply to request 3 from 10.0.7.7, 3 ms
