Creating a redundant network ring with 2 Cisco 1941 routers and 2 catalyst 2960 switches with1 bridge radio and 1 mikrotik radio router in the middle. Issue with connected routes thru a switch questions for a network guru.

[jonas.ostmeyer2000@yahoo.com]

Hello,

Let me first explain what I am configuring here to help explain what I am creating.  You can see my network in the attached diagram.

Here is the issue I am having I would like to have a redundant path if one of my RF paths go down between my 2 radio's or a radio itself goes down.  Lets say that Basic Sm bridge MikroTik goes down I need for the redundant path to to be taken but since my cisco routers are connected to a switch they think the radio path is still up even though the radio is down.  Like in the example below.

Every thing INSV:

Gateway of last resort is c.c.251.251 to network 0.0.0.0

O*E1 0.0.0.0/0 [110/2] via c.c.251.251, 00:06:00, Vlan200
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via c.c.251.251, 00:06:00, Vlan200
10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C a.a.80.32/28 is directly connected, GigabitEthernet0/1
L a.a.80.34/32 is directly connected, GigabitEthernet0/1
C c.c.251.0/24 is directly connected, Vlan200
L c.c.251.1/32 is directly connected, Vlan200
O b.b.252.0/24 [110/2] via a.a.80.33, 00:01:06, GigabitEthernet0/1

sh ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
1.1.1.1 1 FULL/DR 00:00:23 c.c.251.251 Vlan200
b.b.252.1 1 FULL/DR 00:00:37 a.a.80.33 GigabitEthernet0/1
DIV-HILL-1941#

So if I want to reach anything on c.c.251.0/24 network I can take vlan200 route over and this works.

However if my vlan 200 radio goes down c.c.251.250,

RTR 2 still sees this path up VLAN 200 thru my switch 2.

Here taking down Radio #2 ip = c.c.251.250

Gateway of last resort is 10.45.80.33 to network 0.0.0.0

O*E1 0.0.0.0/0 [110/3] via 10.45.80.33, 00:01:18, GigabitEthernet0/1
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/12] via a.a.80.33, 00:01:18, GigabitEthernet0/1
10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C a.a.80.32/28 is directly connected, GigabitEthernet0/1
L a.a.80.34/32 is directly connected, GigabitEthernet0/1
C c.c.251.0/24 is directly connected, Vlan200
L c.c.251.1/32 is directly connected, Vlan200
O b.b.252.0/24 [110/2] via a.a.80.33, 00:08:17, GigabitEthernet0/1

#sh ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
b.b.252.1 1 FULL/DR 00:00:32 a.a.80.33 GigabitEthernet0/1

You can see that from RTR #2 that vlan 200 to c.c.251.0/24 is still INSV.  Which from the router's point of view it is but is there any way I can tell the RTR #2 that this path is no longer valid via the switch as the far end radio is down?

I can get it to work if I put in static routes shrinking the subnet so that the path picks the more precise path but this is not really scalable as I have to brake up the c.c.251.0 /24 subnet into c.c.251.1/25 and c.c.251.129/25.

Just looking for idea's on how to tell a router a connected path is down past the switch so we can use the backup path via RTR2-RTR1-Switch #1-Radio #1?

Thanks for any input.

[Joseph W. Doherty]

I'm a bit lost understanding your diagram. But if you have two paths, and you run an IGP on both paths, your IGP should detect both path loss and restoration and route accordingly.

If you want to do similar with static routing, you'll need to tie it to IP SLA tests, which will remove the route when the SLA test fails.

[jonas.ostmeyer2000@yahoo.com]

Thanks for the quick response.Let me know if I can clarify anything on my diagram for a better understanding of my network layout.
I do have OSPF running on my 3 routers Rtr #1 cisco, Rtr #2 and Mikrotik radio Rtr.
Here is my issueWhen I take down the path to my c.c.145.1 network via the radio path Rtr #2 does see the neighbor go down as it should however this Rtr #2 thinks this network is still reachable via connected vlan 200 as vlan 200 is connected via a switch as in my diagram.
Network ring:
Rtr #2 <---> Cisco Switch #2 <---> Mikrotik SM Bridge Radio #2 <---> Mikrotik AP Rtr #3 radio #1 <---> Cisco Switch #1 <---> Rtr #1 <---> Rtr #2
If I take down my main path MikroTik SM bridge Radio (c.c.251.250) I should route the traffic to c.c.251.251 now back to Rtr #1(a.a.80.33) to Rtr #3 (b.b.253.252/c.c.251.251 as Rtr #2 sees the neighbor go down and my gateway of last resort changes but as you can see below vlan 200 stays up even though its unreachable.  I am thinking since connected routes take precedence over any OSPF AD 110 that until the router see's vlan 200 down it will not re-route traffic.
My configuration works (redundancy path testing) if I take out all switches and have my nodes directly connected to my routers.  In this configuration when I take down one of my radio path's the vlan in question goes down so the router re-routes the traffic as expected.



Here is the issue in exact detail and please feel free if you need more information.
See below:
Before I take down Radio #2:

Rtr #2# sh ip ospf neighbor
Neighbor ID     Pri   State           Dead Time   Address         Interface1.1.1.1           1   FULL/BDR        00:00:36    c.c.251.251  Vlan200b.b.252.1      1   FULL/DR         00:00:36    a.a.80.33     GigabitEthernet0/1 DIV-HILL-1941#sh ip routeCodes: 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       + - replicated route, % - next hop override
Gateway of last resort is c.c.251.251 to network 0.0.0.0
O*E1  0.0.0.0/0 [110/2] via c.c.251.251, 00:02:20, Vlan200      1.0.0.0/32 is subnetted, 1 subnetsO        1.1.1.1 [110/11] via c.c.251.251, 00:02:20, Vlan200      10.0.0.0/8 is variably subnetted, 5 subnets, 3 masksC        a.a.80.32/28 is directly connected, GigabitEthernet0/1L        a.a.80.34/32 is directly connected, GigabitEthernet0/1C        c.c.251.0/24 is directly connected, Vlan200L        c.c.251.1/32 is directly connected, Vlan200O        b.b.252.0/24 [110/2] via a.a.80.33, 00:23:00, GigabitEthernet0/1
Rtr#2 #ping c.c.251.251
Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to c.c.251.251, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 4/6/8 msRtr #2 #


Rtr #2 #traceroute c.c.251.251
Type escape sequence to abort.Tracing the route to c.c.251.251VRF info: (vrf in name/id, vrf out name/id)  1 c.c.251.251 4 msec 4 msec 4 msec




After I take down Radio #2
Jan 16 13:34:41.591: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Vlan200 from FULL to DOWN, Neighbor Down: Dead timer expired.....

Rtr #2 #sh ip ospf neighbor
Neighbor ID     Pri   State           Dead Time   Address         Interfaceb.b.252.1      1   FULL/DR         00:00:39    a.a.80.33     GigabitEthernet0/1


Rtr #2#sh ip routeCodes: 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       + - replicated route, % - next hop override
Gateway of last resort is a.a.80.33 to network 0.0.0.0
O*E1  0.0.0.0/0 [110/3] via a.a.80.33, 00:00:29, GigabitEthernet0/1      1.0.0.0/32 is subnetted, 1 subnetsO        1.1.1.1 [110/12] via a.a.80.33, 00:00:29, GigabitEthernet0/1      10.0.0.0/8 is variably subnetted, 5 subnets, 3 masksC        a.a.80.32/28 is directly connected, GigabitEthernet0/1L        a.a.80.34/32 is directly connected, GigabitEthernet0/1C        c.c.251.0/24 is directly connected, Vlan200L        c.c.251.1/32 is directly connected, Vlan200O        b.b.252.0/24 [110/2] via a.a.80.33, 00:12:42, GigabitEthernet0/1
Rtr #2 #ping c.c.251.251
Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to c.c.251.251, timeout is 2 seconds:.....Success rate is 0 percent (0/5)

DIV-HILL-1941#traceroute c.c.251.251Type escape sequence to abort.Tracing the route to c.c.251.251VRF info: (vrf in name/id, vrf out name/id)  1  *  *  *  2  *  *  *  3  *  *  *  4  *  *  *  5  *  *  *  6

Thanks so much for your assistance.

[jonas.ostmeyer2000@yahoo.com]

• Thanks for the quick response.

  Let me know if I can clarify anything on my diagram for a better understanding of my network layout.

  I do have OSPF running on my 3 routers Rtr #1 cisco, Rtr #2 and Mikrotik radio Rtr.

  Here is my issue

  When I take down the path to my c.c.145.1 network via the radio path Rtr #2 does see the neighbor go down as it should however this Rtr #2 thinks this network is still reachable via connected vlan 200 as vlan 200 is connected via a switch as in my diagram.

  Network ring:

  Rtr #2 <---> Cisco Switch #2 <---> Mikrotik SM Bridge Radio #2 <---> Mikrotik AP Rtr #3 radio #1 <---> Cisco Switch #1 <---> Rtr #1 <---> Rtr #2

  If I take down my main path MikroTik SM bridge Radio (c.c.251.250) I should route the traffic to c.c.251.251 now back to Rtr #1(a.a.80.33) to Rtr #3 (b.b.253.252/c.c.251.251 as Rtr #2 sees the neighbor go down and my gateway of last resort changes but as you can see below vlan 200 stays up even though its unreachable.  I am thinking since connected routes take precedence over any OSPF AD 110 that until the router see's vlan 200 down it will not re-route traffic.

  My configuration works (redundancy path testing) if I take out all switches and have my nodes directly connected to my routers.  In this configuration when I take down one of my radio path's the vlan in question goes down so the router re-routes the traffic as expected.

  Here is the issue in exact detail and please feel free if you need more information.

  See below:

  Before I take down Radio #2:

  Rtr #2# sh ip ospf neighbor

  Neighbor ID     Pri   State           Dead Time   Address         Interface

  1.1.1.1           1   FULL/BDR        00:00:36    c.c.251.251  Vlan200

  b.b.252.1      1   FULL/DR         00:00:36    a.a.80.33     GigabitEthernet0/1

  DIV-HILL-1941#sh 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

         + - replicated route, % - next hop override

  Gateway of last resort is c.c.251.251 to network 0.0.0.0

  O*E1  0.0.0.0/0 [110/2] via c.c.251.251, 00:02:20, Vlan200

        1.0.0.0/32 is subnetted, 1 subnets

  O        1.1.1.1 [110/11] via c.c.251.251, 00:02:20, Vlan200

        10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks

  C        a.a.80.32/28 is directly connected, GigabitEthernet0/1

  L        a.a.80.34/32 is directly connected, GigabitEthernet0/1

  C        c.c.251.0/24 is directly connected, Vlan200

  L        c.c.251.1/32 is directly connected, Vlan200

  O        b.b.252.0/24 [110/2] via a.a.80.33, 00:23:00, GigabitEthernet0/1

  Rtr#2 #ping c.c.251.251

  Type escape sequence to abort.

  Sending 5, 100-byte ICMP Echos to c.c.251.251, timeout is 2 seconds:

  !!!!!

  Success rate is 100 percent (5/5), round-trip min/avg/max = 4/6/8 ms

  Rtr #2 #

  Rtr #2 #traceroute c.c.251.251

  Type escape sequence to abort.

  Tracing the route to c.c.251.251

  VRF info: (vrf in name/id, vrf out name/id)

    1 c.c.251.251 4 msec 4 msec 4 msec

  After I take down Radio #2

  Jan 16 13:34:41.591: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Vlan200 from FULL to DOWN, Neighbor Down: Dead timer expired.....

  Rtr #2 #sh ip ospf neighbor

  Neighbor ID     Pri   State           Dead Time   Address         Interface

  b.b.252.1      1   FULL/DR         00:00:39    a.a.80.33     GigabitEthernet0/1

  Rtr #2#sh 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

         + - replicated route, % - next hop override

  Gateway of last resort is a.a.80.33 to network 0.0.0.0

  O*E1  0.0.0.0/0 [110/3] via a.a.80.33, 00:00:29, GigabitEthernet0/1

        1.0.0.0/32 is subnetted, 1 subnets

  O        1.1.1.1 [110/12] via a.a.80.33, 00:00:29, GigabitEthernet0/1

        10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks

  C        a.a.80.32/28 is directly connected, GigabitEthernet0/1

  L        a.a.80.34/32 is directly connected, GigabitEthernet0/1

  C        c.c.251.0/24 is directly connected, Vlan200

  L        c.c.251.1/32 is directly connected, Vlan200

  O        b.b.252.0/24 [110/2] via a.a.80.33, 00:12:42, GigabitEthernet0/1

  Rtr #2 #ping c.c.251.251

  Type escape sequence to abort.

  Sending 5, 100-byte ICMP Echos to c.c.251.251, timeout is 2 seconds:

  .....

  Success rate is 0 percent (0/5)

  DIV-HILL-1941#traceroute c.c.251.251

  Type escape sequence to abort.

  Tracing the route to c.c.251.251

  VRF info: (vrf in name/id, vrf out name/id)

    1  *  *  *

    2  *  *  *

    3  *  *  *

    4  *  *  *

    5  *  *  *

    6

  Thanks so much for your assistance.

  ##- Please type your reply above this line -##

[Joseph W. Doherty]

I'm possibly "blind", as I'm not seeing c.c.251.251 on your diagram.

A VLAN being up, shouldn't keep an OSPF path up, provided OSPF sees the neighbor drop. You say you do see the OSPF neighbor drop, that's good, but you also mention something about static routes? A static route would not detect a path break, unless it see a physical interface drop. The question is, why are you "covering" the same path with OSPF and a static route, if that's what you're doing?

I need to run out in a few minutes, but perhaps tonight I'll have more time to study your diagram and try to suss out what you're doing and re-read all your posts.

[Joseph W. Doherty]

Ok, I may understand the issue.

You may be confusing network c.c.251.0/24 still being reachable on VLAN 200 from RTR 2 vs. interface IP c.c.251.251 not being reachable when the wireless bridge link is down. The latter's interface should go down with the wireless bridge link. If it doesn't, OSPF, on RTR 3 would advertise c.c.251.0/24, which would be a bad thing.

More telling is what RTR 1 or RTR 3 see, in their route table, for c.c.251.0/24.

[jonas.ostmeyer2000@yahoo.com]

Joe, Thanks for all your assistance.
Maybe I am incorrect but from Rtr 2 I should be able to reach over to c.c.251.251 via the gateway of last resort but since vlan 200 stays INSV and is connected how does the router know that other than seeing the OSPF neighbor go down?  The issue I see is the RTR #2 thinks that the path is over the vlan 200 interface and since that interface does not ever go down Rtr #2 does not try to route over the gateway of last resort even though the OSPF path to c.c.251.251 is down and the router does see that OSPF neighbor go down.
I don't have any static routes built into the routers also just fyi.  I am pretty sure my configuration needs some adjustments but I am having a hard time determining what I need to change in my configuration.  I am open to suggestions.


Here are the routing tables before I take down the wireless bridge (radio c.c.251.250):
Rtr #1
Rtr #1 #sh ip routeCodes: 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, + - replicated route
Gateway of last resort is b.b.252.253 to network 0.0.0.0
O*E1  0.0.0.0/0 [110/2] via b.b.252.253, 04:01:43, Vlan100      1.0.0.0/32 is subnetted, 1 subnetsO        1.1.1.1 [110/11] via b.b.252.253, 04:01:43, Vlan100      a.0.0.0/8 is variably subnetted, 5 subnets, 3 masksC        a.a.80.32/28 is directly connected, GigabitEthernet0/0L        a.a.80.33/32 is directly connected, GigabitEthernet0/0O        c.c.251.0/24 [110/2] via a.a.80.34, 04:08:43, GigabitEthernet0/0C        b.b.252.0/24 is directly connected, Vlan100L        b.b.252.1/32 is directly connected, Vlan100Rtr #1 #


Rtr #2Rtr #2 #sh ip routeCodes: 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       + - replicated route, % - next hop override
Gateway of last resort is c.c.251.251 to network 0.0.0.0
O*E1  0.0.0.0/0 [110/2] via c.c.251.251, 03:42:26, Vlan200      1.0.0.0/32 is subnetted, 1 subnetsO        1.1.1.1 [110/11] via c.c.251.251, 03:42:26, Vlan200      a.0.0.0/8 is variably subnetted, 5 subnets, 3 masksC        a.a.80.32/28 is directly connected, GigabitEthernet0/1L        a.a.80.34/32 is directly connected, GigabitEthernet0/1C        c.c.251.0/24 is directly connected, Vlan200L        c.c.251.1/32 is directly connected, Vlan200O        b.b.252.0/24 [110/2] via a.a.80.33, 03:49:58, GigabitEthernet0/1Rtr #2 #

Radio Rtr #3
[admin@_RING] /ip> route print Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit # DST-ADDRESS PREF-SRC GATEWAY DISTANCE 0 A S 0.0.0.0/0 b.b.252.1 1 1 ADC 1.1.1.1/32 1.1.1.1 loopback 0 2 ADo a.a.80.32/28 b.b.252.1 110 c.c.251.1 3 ADC c.c.251.0/24 c.c.251.251 wlan1 0 4 ADC b.b.252.0/24 b.b.252.253 ether1 0[admin@RING
] /ip>  



Rtr #2 OSPF neighbor before taking radio down.
Rtr #2 #sh ip ospf neighbor
Neighbor ID     Pri   State           Dead Time   Address         Interface1.1.1.1           1   FULL/BDR        00:00:31    c.c.251.251  Vlan200b.b.252.1   1   FULL/DR         00:00:34    a.a.80.33  GigabitEthernet0/1



Taking down bridge Radio #2 (b.b.251.250) here:





Rtr #1

Rtr 1#sh ip routeCodes: 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, + - replicated route
Gateway of last resort is b.b.252.253 to network 0.0.0.0
O*E1  0.0.0.0/0 [110/2] via b.b.252.253, 04:06:32, Vlan100      1.0.0.0/32 is subnetted, 1 subnetsO        1.1.1.1 [110/11] via b.b.252.253, 04:06:32, Vlan100      a.0.0.0/8 is variably subnetted, 5 subnets, 3 masksC        a.a.80.32/28 is directly connected, GigabitEthernet0/0L        a.a.80.33/32 is directly connected, GigabitEthernet0/0O        c.c.251.0/24 [110/2] via a.a.80.34, 04:13:32, GigabitEthernet0/0C        b.b.252.0/24 is directly connected, Vlan100L        c.c.252.1/32 is directly connected, Vlan100Rtr 1#
Rtr #2

Rtr #2 #sh ip routeCodes: 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       + - replicated route, % - next hop override
Gateway of last resort is a.a.80.33 to network 0.0.0.0
O*E1  0.0.0.0/0 [110/3] via a.a.80.33, 00:02:24, GigabitEthernet0/1      1.0.0.0/32 is subnetted, 1 subnetsO        1.1.1.1 [110/12] via a.a.80.33, 00:02:24, GigabitEthernet0/1a.0.0.0/8 variably subnetted, 5 subnets, 3 masksC        a.a.80.32/28 is directly connected, GigabitEthernet0/1L        a.a.80.34/32 is directly connected, GigabitEthernet0/1C        b.b.251.0/24 is directly connected, Vlan200L        b.b.251.1/32 is directly connected, Vlan200O        b.b.252.0/24 [110/2] via a.a.80.33, 04:16:10, GigabitEthernet0/1


Radio Rtr #3
admin@RING/ip> route print Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit # DST-ADDRESS PREF-SRC GATEWAY DISTANCE 0 A S 0.0.0.0/0 b.b.252.1 1 1 ADC 1.1.1.1/32 1.1.1.1 loopback 0 2 ADo a.a.80.32/28 b.b.252.1 110 3 ADo c.c.251.0/24 b.b.252.1 110 4 DC c.c.251.0/24 c.c.251.251 wlan1 255 5 ADC b.b.252.0/24 b.b.252.253 ether1 0[admin@JTO_RING_AP] /ip>  


Rtr #2 OSPF neighbor after taking radio down.
#sh ip ospf neighbor
Neighbor ID     Pri   State           Dead Time   Address         Interfaceb.b.252.1      1   FULL/DR         00:00:35    a.a.80.33     GigabitEthernet0/1

Thanks again for your assistance.

[jonas.ostmeyer2000@yahoo.com]

Joe,

Here is a better view:

Thanks for all your assistance.

Maybe I am incorrect but from Rtr 2 I should be able to reach over to c.c.251.251 via the gateway of last resort but since vlan 200 stays INSV and is connected how does the router know that other than seeing the OSPF neighbor go down?  The issue I see is the RTR #2 thinks that the path is over the vlan 200 interface and since that interface does not ever go down Rtr #2 does not try to route over the gateway of last resort even though the OSPF path to c.c.251.251 is down and the router does see that OSPF neighbor go down.

I don't have any static routes built into the routers also just fyi.  I am pretty sure my configuration needs some adjustments but I am having a hard time determining what I need to change in my configuration.  I am open to suggestions.

Here are the routing tables before I take down the wireless bridge (radio c.c.251.250):

Rtr #1

Rtr #1 #sh 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, + - replicated route

Gateway of last resort is b.b.252.253 to network 0.0.0.0

O*E1  0.0.0.0/0 [110/2] via b.b.252.253, 04:01:43, Vlan100

      1.0.0.0/32 is subnetted, 1 subnets

O        1.1.1.1 [110/11] via b.b.252.253, 04:01:43, Vlan100

      a.0.0.0/8 is variably subnetted, 5 subnets, 3 masks

C        a.a.80.32/28 is directly connected, GigabitEthernet0/0

L        a.a.80.33/32 is directly connected, GigabitEthernet0/0

O        c.c.251.0/24 [110/2] via a.a.80.34, 04:08:43, GigabitEthernet0/0

C        b.b.252.0/24 is directly connected, Vlan100

L        b.b.252.1/32 is directly connected, Vlan100

Rtr #1 #

Rtr #2

Rtr #2 #sh 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

       + - replicated route, % - next hop override

Gateway of last resort is c.c.251.251 to network 0.0.0.0

O*E1  0.0.0.0/0 [110/2] via c.c.251.251, 03:42:26, Vlan200

      1.0.0.0/32 is subnetted, 1 subnets

O        1.1.1.1 [110/11] via c.c.251.251, 03:42:26, Vlan200

      a.0.0.0/8 is variably subnetted, 5 subnets, 3 masks

C        a.a.80.32/28 is directly connected, GigabitEthernet0/1

L        a.a.80.34/32 is directly connected, GigabitEthernet0/1

C        c.c.251.0/24 is directly connected, Vlan200

L        c.c.251.1/32 is directly connected, Vlan200

O        b.b.252.0/24 [110/2] via a.a.80.33, 03:49:58, GigabitEthernet0/1

Rtr #2 #

Radio Rtr #3

[admin@_RING] /ip> route print  Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit #

DST-ADDRESS PREF-SRC GATEWAY DISTANCE

0 A S 0.0.0.0/0 b.b.252.1 1

1 ADC 1.1.1.1/32 1.1.1.1

loopback 0

2 ADo a.a.80.32/28 b.b.252.1 110 c.c.251.1

3 ADC c.c.251.0/24 c.c.251.251 wlan1 0

4 ADC b.b.252.0/24 b.b.252.253 ether1 0

Rtr #2 OSPF neighbor before taking radio down.

Rtr #2 #sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface

1.1.1.1           1   FULL/BDR        00:00:31    c.c.251.251  Vlan200

b.b.252.1   1   FULL/DR         00:00:34    a.a.80.33  GigabitEthernet0/1

Taking down bridge Radio #2 (b.b.251.250) here:

Rtr #1

Rtr 1#sh 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, + - replicated route

Gateway of last resort is b.b.252.253 to network 0.0.0.0

O*E1  0.0.0.0/0 [110/2] via b.b.252.253, 04:06:32, Vlan100

      1.0.0.0/32 is subnetted, 1 subnets

O        1.1.1.1 [110/11] via b.b.252.253, 04:06:32, Vlan100

      a.0.0.0/8 is variably subnetted, 5 subnets, 3 masks

C        a.a.80.32/28 is directly connected, GigabitEthernet0/0

L        a.a.80.33/32 is directly connected, GigabitEthernet0/0

O        c.c.251.0/24 [110/2] via a.a.80.34, 04:13:32, GigabitEthernet0/0

C        b.b.252.0/24 is directly connected, Vlan100

L        c.c.252.1/32 is directly connected, Vlan100

Rtr 1#

Rtr #2

Rtr #2 #sh 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

       + - replicated route, % - next hop override

Gateway of last resort is a.a.80.33 to network 0.0.0.0

O*E1  0.0.0.0/0 [110/3] via a.a.80.33, 00:02:24, GigabitEthernet0/1

      1.0.0.0/32 is subnetted, 1 subnets

O        1.1.1.1 [110/12] via a.a.80.33, 00:02:24, GigabitEthernet0/1

a.0.0.0/8 variably subnetted, 5 subnets, 3 masks

C        a.a.80.32/28 is directly connected, GigabitEthernet0/1

L        a.a.80.34/32 is directly connected, GigabitEthernet0/1

C        b.b.251.0/24 is directly connected, Vlan200

L        b.b.251.1/32 is directly connected, Vlan200

O        b.b.252.0/24 [110/2] via a.a.80.33, 04:16:10, GigabitEthernet0/1

Radio Rtr #3

admin@RING/ip> route print 

Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit

# DST-ADDRESS PREF-SRC GATEWAY DISTANCE

0 A S 0.0.0.0/0 b.b.252.1 1

1 ADC 1.1.1.1/32 1.1.1.1 loopback 0

2 ADo a.a.80.32/28 b.b.252.1 110

3 ADo c.c.251.0/24 b.b.252.1 110

4 DC c.c.251.0/24 c.c.251.251 wlan1 255

5 ADC b.b.252.0/24 b.b.252.253 ether1 0  

Rtr #2 OSPF neighbor after taking radio down.

#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface

b.b.252.1      1   FULL/DR         00:00:35    a.a.80.33     GigabitEthernet0/1

Thanks again for your assistance.

[jonas.ostmeyer2000@yahoo.com]

Joe,

Again thanks for all your assistance. I wanted to see if you had any comments/thoughts regarding my latest posting?

Thanks again,