Hello community,
I have a little problem while playing with default route redistribution in my Hub and Spoke lab.
Please see topology bellow:
I would like to configure a default route on the London - HUB and this default route should be redistributed to spokes Manchester and Newcastle.
London - HUB config:
hostname LONDON interface Loopback0 ipv4 address 4.4.4.4 255.255.255.255 ! interface GigabitEthernet0/0/0/0 ipv4 address 10.1.4.4 255.255.255.0 ! router ospf 1 router-id 4.4.4.4 default-information originate always area 0 interface Loopback0 passive enable ! interface GigabitEthernet0/0/0/0 network point-to-point ! ! !
PE1 configuration:
vrf definition london rd 65001:1 ! address-family ipv4 route-target export 65001:1 route-target import 65001:3 route-target import 65001:2 exit-address-family ! vrf definition manchester rd 65001:3 ! address-family ipv4 route-target export 65001:3 route-target import 65001:1 exit-address-family ! vrf definition newcastle rd 65001:2 ! address-family ipv4 route-target export 65001:2 route-target import 65001:1 exit-address-family ! interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface GigabitEthernet0/0 vrf forwarding london ip address 10.1.4.1 255.255.255.0 ip ospf network point-to-point ! interface GigabitEthernet0/1 vrf forwarding newcastle ip address 10.1.2.1 255.255.255.0 ip ospf network point-to-point ! interface GigabitEthernet0/2 vrf forwarding manchester ip address 10.1.3.1 255.255.255.0 ip ospf network point-to-point ! router ospf 1 vrf london router-id 1.1.1.1 redistribute bgp 1 subnets network 10.1.4.0 0.0.0.255 area 0 ! router ospf 2 vrf newcastle redistribute bgp 1 subnets network 10.1.2.0 0.0.0.255 area 0 ! router ospf 3 vrf manchester redistribute bgp 1 subnets network 10.1.3.0 0.0.0.255 area 0 ! router bgp 1 bgp log-neighbor-changes ! address-family ipv4 vrf london redistribute connected redistribute ospf 1 match internal external 1 external 2 default-information originate exit-address-family ! address-family ipv4 vrf manchester redistribute connected redistribute ospf 3 match internal external 1 external 2 exit-address-family ! address-family ipv4 vrf newcastle redistribute connected redistribute ospf 2 match internal external 1 external 2 exit-address-family !
Manchester - SPOKE config:
interface Loopback0 ip address 3.3.3.3 255.255.255.255 ip ospf 1 area 0 ! interface GigabitEthernet0/2 ip address 10.1.3.3 255.255.255.0 ip ospf network point-to-point ip ospf 1 area 0 ! router ospf 1 router-id 3.3.3.3 passive-interface Loopback0 !
Newcastle - SPOKE config:
interface Loopback0 ip address 2.2.2.2 255.255.255.255 ip ospf 1 area 0 ! interface GigabitEthernet0/1 ip address 10.1.2.2 255.255.255.0 ip ospf network point-to-point ip ospf 1 area 0 ! router ospf 1 router-id 2.2.2.2 passive-interface Loopback0 !
Now what I did:
1. Advertise the default route from HUB into OSPF and send it to the PE1 neighbor - this is working
PE1#show ip route vrf london
Routing Table: london
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is 10.1.4.4 to network 0.0.0.0
O*E2 0.0.0.0/0 [110/1] via 10.1.4.4, 02:35:58, GigabitEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
B 2.2.2.2 [20/2] via 10.1.2.2 (newcastle), 00:17:01, GigabitEthernet0/1
3.0.0.0/32 is subnetted, 1 subnets
B 3.3.3.3
[20/2] via 10.1.3.3 (manchester), 00:17:01, GigabitEthernet0/2
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 10.1.4.4, 02:37:11, GigabitEthernet0/0
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
B 10.1.2.0/24 is directly connected, 00:17:01, GigabitEthernet0/1
L 10.1.2.1/32 is directly connected, GigabitEthernet0/1
B 10.1.3.0/24 is directly connected, 00:17:01, GigabitEthernet0/2
L 10.1.3.1/32 is directly connected, GigabitEthernet0/2
C 10.1.4.0/24 is directly connected, GigabitEthernet0/0
L 10.1.4.1/32 is directly connected, GigabitEthernet0/0
2. Redistribute this route into BGP and create a VPNv4 prefix (with RT=65001:1) - this is also working:
PE1#show bgp vpnv4 uni vrf london 0.0.0.0
BGP routing table entry for 65001:1:0.0.0.0/0, version 2
Paths: (1 available, best #1, table london)
Not advertised to any peer
Refresh Epoch 1
Local
10.1.4.4 (via vrf london) from 0.0.0.0 (1.1.1.1)
Origin incomplete, metric 1, localpref 100, weight 32768, valid, sourced, best
Extended Community: RT:65001:1 OSPF DOMAIN ID:0x0005:0x000000010200
OSPF RT:0.0.0.0:5:1 OSPF ROUTER ID:1.1.1.1:0
rx pathid: 0, tx pathid: 0x0
3. Now import this route into VRF Manchester as well as Newcastle - also working:
PE1#show ip route vrf manchester 0.0.0.0
Routing Table: manchester
Routing entry for 0.0.0.0/0, supernet
Known via "bgp 1", distance 20, metric 1, candidate default path, type external
Redistributing via ospf 3
Last update from 10.1.4.4 on GigabitEthernet0/0, 00:19:34 ago
Routing Descriptor Blocks:
* 10.1.4.4 (london), from 0.0.0.0, 00:19:34 ago, via GigabitEthernet0/0
Route metric is 1, traffic share count is 1
AS Hops 0
MPLS label: none
PE1#show ip route vrf newcastle 0.0.0.0
Routing Table: newcastle
Routing entry for 0.0.0.0/0, supernet
Known via "bgp 1", distance 20, metric 1, candidate default path, type external
Redistributing via ospf 2
Last update from 10.1.4.4 on GigabitEthernet0/0, 00:19:55 ago
Routing Descriptor Blocks:
* 10.1.4.4 (london), from 0.0.0.0, 00:19:55 ago, via GigabitEthernet0/0
Route metric is 1, traffic share count is 1
AS Hops 0
MPLS label: none
4. Import this default route into the OSPF database and sent it to OSPF peers Manchester and Newcastle - this is not working:
PE1#show ip ospf database
OSPF Router with ID (10.1.3.1) (Process ID 3)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
3.3.3.3 3.3.3.3 1457 0x80000007 0x0001B8 3
10.1.3.1 10.1.3.1 1476 0x80000007 0x00587A 2
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
4.4.4.4 10.1.3.1 1266 0x80000001 0x00C37D 3489660929
10.1.4.0 10.1.3.1 1266 0x80000001 0x00B78B 3489660929
OSPF Router with ID (10.1.2.1) (Process ID 2)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 1430 0x80000007 0x00C108 3
10.1.2.1 10.1.2.1 1453 0x80000007 0x0026B4 2
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
4.4.4.4 10.1.2.1 1266 0x80000001 0x00CA77 3489660929
10.1.4.0 10.1.2.1 1266 0x80000001 0x00BE85 3489660929
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1691 0x80000008 0x00855C 2
4.4.4.4 4.4.4.4 1608 0x80000008 0x005959 3
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 4.4.4.4 1608 0x80000005 0x00BAE3 1
2.2.2.2 1.1.1.1 1266 0x80000001 0x007FD4 3489660929
3.3.3.3 1.1.1.1 1266 0x80000001 0x0051FE 3489660929
10.1.2.0 1.1.1.1 1266 0x80000001 0x002D23 3489660929
10.1.3.0 1.1.1.1 1266 0x80000001 0x00222D 3489660929
Just to confirm there is no OSPF default route in the SPOKEs RIBs:
Routing table on Manchester - no default route:
Manchester#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
4.0.0.0/32 is subnetted, 1 subnets
O E2 4.4.4.4 [110/2] via 10.1.3.1, 00:22:32, GigabitEthernet0/2
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.1.3.0/24 is directly connected, GigabitEthernet0/2
L 10.1.3.3/32 is directly connected, GigabitEthernet0/2
O E2 10.1.4.0/24 [110/1] via 10.1.3.1, 00:22:32, GigabitEthernet0/2
Routing table on Newcastle- no default route:
Necastle#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
4.0.0.0/32 is subnetted, 1 subnets
O E2 4.4.4.4 [110/2] via 10.1.2.1, 00:22:26, GigabitEthernet0/1
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.1.2.0/24 is directly connected, GigabitEthernet0/1
L 10.1.2.2/32 is directly connected, GigabitEthernet0/1
O E2 10.1.4.0/24 [110/1] via 10.1.2.1, 00:22:26, GigabitEthernet0/1
So I have 2 questions:
1 - In order to redistribute the default route from OSPF to BGP, do I really need to create the "redistribute" as well as "default-information originate" statements?
2 - Why there is no default route on spokes :(
Much appreciated your help guys.
Thank you.
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