08-13-2012 06:09 AM
Hi All,
I have a core network with four routers (R2,R7,R8 and R9). These routers must all run ISIS ipv4 and ipv6 on all their connected interfaces including the loopkbacks. This i achived without any hassle, (see the config and the routing table below).
The same four routers must also run OSPF v2 and v3, unfortunately once the OSPF is deployed, i can no longer see the ISIS routes, both for v4 and v6. Any idea what i might be doing wrong?. Please do study my configs well before response, as address-family ipv6 and multi-topology are in the right places. The configs seen here are the same on teh remaining router.
R2#sr int lo0
Building configuration...
Current configuration : 159 bytes
!
interface Loopback0
ip address 2.2.0.2 255.255.255.255
ip router isis 2789
ipv6 address 2002:2:2::2/128
ipv6 router isis 2789
ipv6 ospf 300 area 0
end
R2#sr int g0/0
Building configuration...
Current configuration : 229 bytes
!
interface GigabitEthernet0/0
ip address 2.2.29.2 255.255.255.0
ip router isis 2789
duplex full
speed 1000
media-type gbic
negotiation auto
ipv6 address 2002:2:2:29::2/64
ipv6 router isis 2789
ipv6 ospf 300 area 0
end
R2#sr int g1/0
Building configuration...
Current configuration : 187 bytes
!
interface GigabitEthernet1/0
ip address 2.2.28.2 255.255.255.0
ip router isis 2789
negotiation auto
ipv6 address 2002:2:2:28::2/64
ipv6 router isis 2789
ipv6 ospf 300 area 0
end
R2#sr int g2/0
Building configuration...
Current configuration : 187 bytes
!
interface GigabitEthernet2/0
ip address 2.2.27.2 255.255.255.0
ip router isis 2789
negotiation auto
ipv6 address 2002:2:2:27::2/64
ipv6 router isis 2789
ipv6 ospf 300 area 0
end
R2#
R2#sh isis dat
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R2.00-00 * 0x00000009 0x2CE7 1119 0/0/0
R7.00-00 0x00000008 0x4FA2 1111 0/0/0
R7.02-00 0x00000001 0x76C0 1063 0/0/0
R8.00-00 0x00000005 0x9C04 1101 0/0/0
R8.02-00 0x00000001 0x77BD 1094 0/0/0
R8.03-00 0x00000001 0xD45A 1098 0/0/0
R9.00-00 0x00000007 0x414F 1121 0/0/0
R9.02-00 0x00000001 0xDC51 1111 0/0/0
R9.03-00 0x00000001 0x71C0 1118 0/0/0
R2#
R2#sir isis
2.0.0.0/8 is variably subnetted, 9 subnets, 2 masks
i L1 2.2.0.7/32 [115/20] via 2.2.27.7, GigabitEthernet2/0
i L1 2.2.0.8/32 [115/20] via 2.2.28.8, GigabitEthernet1/0
i L1 2.2.0.9/32 [115/20] via 2.2.29.9, GigabitEthernet0/0
i L1 2.2.78.0/24 [115/20] via 2.2.28.8, GigabitEthernet1/0
[115/20] via 2.2.27.7, GigabitEthernet2/0
i L1 2.2.79.0/24 [115/20] via 2.2.29.9, GigabitEthernet0/0
[115/20] via 2.2.27.7, GigabitEthernet2/0
R2#
R2#
R2#sh ipv6 route isis
IPv6 Routing Table - Default - 13 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
EX - EIGRP external
O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
I1 2002:2:2::7/128 [115/20]
via FE80::C811:15FF:FE78:8, GigabitEthernet2/0
I1 2002:2:2::8/128 [115/20]
via FE80::C812:15FF:FE78:8, GigabitEthernet1/0
I1 2002:2:2::9/128 [115/20]
via FE80::C813:FFF:FE0C:1C, GigabitEthernet0/0
I1 2002:2:2:78::/64 [115/20]
via FE80::C811:15FF:FE78:8, GigabitEthernet2/0
via FE80::C812:15FF:FE78:8, GigabitEthernet1/0
I1 2002:2:2:79::/64 [115/20]
via FE80::C811:15FF:FE78:8, GigabitEthernet2/0
via FE80::C813:FFF:FE0C:1C, GigabitEthernet0/0
R2#
R2#
R2#sr | sec router isis
ip router isis 2789
ipv6 router isis 2789
ip router isis 2789
ipv6 router isis 2789
ip router isis 2789
ipv6 router isis 2789
ip router isis 2789
ipv6 router isis 2789
router isis 2789
net 47.0002.0000.0000.0002.00
is-type level-1
metric-style wide
!
address-family ipv6
multi-topology
exit-address-family
R2#sh clns nei
System Id Interface SNPA State Holdtime Type Protocol
R9 Gi0/0 ca13.0f0c.001c Up 8 L1 M-ISIS
R8 Gi1/0 ca12.1578.0008 Up 8 L1 M-ISIS
R7 Gi2/0 ca11.1578.0008 Up 9 L1 M-ISIS
R2#
R2#sr | sec router ospf
router ospf 200
log-adjacency-changes
network 2.2.0.0 0.0.255.255 area 0
ipv6 router ospf 300
router-id 2.2.0.2
log-adjacency-changes
R2#
Now i can only see OSPF v2 and v3 BUT ISIS is no longer seen.!!!
==============================================
R2#sir ospf
2.0.0.0/8 is variably subnetted, 10 subnets, 2 masks
O 2.2.0.7/32 [110/2] via 2.2.27.7, 00:55:39, GigabitEthernet2/0
O 2.2.0.8/32 [110/2] via 2.2.28.8, 00:55:29, GigabitEthernet1/0
O 2.2.0.9/32 [110/2] via 2.2.29.9, 00:55:49, GigabitEthernet0/0
O 2.2.69.0/24 [110/2] via 2.2.29.9, 00:55:49, GigabitEthernet0/0
O 2.2.78.0/24 [110/2] via 2.2.28.8, 00:55:29, GigabitEthernet1/0
[110/2] via 2.2.27.7, 00:55:29, GigabitEthernet2/0
O 2.2.79.0/24 [110/2] via 2.2.29.9, 00:55:49, GigabitEthernet0/0
[110/2] via 2.2.27.7, 00:55:09, GigabitEthernet2/0
R2#
R2#sh ipv6 route ospf
IPv6 Routing Table - Default - 13 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
EX - EIGRP external
O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
O 2002:2:2::7/128 [110/1]
via FE80::C811:15FF:FE78:8, GigabitEthernet2/0
O 2002:2:2::8/128 [110/1]
via FE80::C812:15FF:FE78:8, GigabitEthernet1/0
O 2002:2:2::9/128 [110/1]
via FE80::C813:FFF:FE0C:1C, GigabitEthernet0/0
O 2002:2:2:78::/64 [110/2]
via FE80::C812:15FF:FE78:8, GigabitEthernet1/0
via FE80::C811:15FF:FE78:8, GigabitEthernet2/0
O 2002:2:2:79::/64 [110/2]
via FE80::C813:FFF:FE0C:1C, GigabitEthernet0/0
via FE80::C811:15FF:FE78:8, GigabitEthernet2/0
R2#
Please do let me know if further info is required to help you help me?.
Thanking you all in advance for your help,
O.A
08-13-2012 06:14 AM
Hi O.A,
nice to see you managed to get ISIS v6 running, the reason for the current behavior is that OSPF has better AD, so once two protocols announce the same route/prefix, the one with better AD secures its place in the RIB.
08-13-2012 06:51 AM
Hi Ivan,
Your answer was super!!!!!! (i was laughing when i saw your reply), unknown to me i was struggling with configs not knowing it was only the AD issue. Now i have partly resolved the problem by increasing the OSPF Distance to 200 but what will be the solution if i want the two routing protocols in my RIB?. CIsco got it done without increasing any cost....."CCIE SP Sample LAB" by Vincent Zhou" SP PM.
I am sure you can grab a copy of his note to see that he never increased any cost, yet got the job done.....
Looking forward to your swift response as usual
O.A
08-13-2012 07:05 AM
Hi O.A.,
i checked the docs available at https://learningnetwork.cisco.com/people/zhoujl?view=overview
there are two independent examples for OSPF and ISIS and no more than that.
You can have both(if not all) IGPs at the same time in the RIB, the only thing that needs to be accounted is that they will appear for different prefixes only, as soon as there is a tie between IGPs for the same prefix, the one with better AD will win and appear in the RIB. All other will kick in in case primary IGP will fail, but this is unlikely since the physical topology is the same and hence all other IGP will see that prefix as withdrawn.
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