VRRP, OSPF and 1-way state.

[Rob Epping]

Hi list,

Today I spend a lot of time debugging why BIRD doesn't get our
IPSO VRRP cluster in 2WAY state, while junos and IOS routers do.

Here's the setup. 1 VLAN with all OSPF routers. Network is X.Y.0.0/28
.1 and .2 are the IPSO nodes, .3 is the VRRP address. IPSO nodes run
OSPF priority 0. At this moment .2 is the VRRP "master".
.4 and .5 are junos routers and are DR and BDR respectively.
.7 is an IOS Version 12.0(28c) router
.8 is an other junos router.
.14 is Debian linux + BIRD.

Both IPSO routers send OSPF messages with RID .3, see below.

17:45:37.773176 O 802.1Q vlan#10 P0 X.53.0.1 > X.53.0.4: OSPFv2-ls_upd
64:
 RID X.Y.0.3 backbone
 { rtr X.Y.0.3 E S 80023430 age 6
 } [|ospf] [tos 0xc0] [ttl 1] (id 6121)

17:47:57.888864 O 802.1Q vlan#10 P0 X.Y.0.2 > X.Y.0.4: OSPFv2-ls_upd 64:
 RID X.Y.0.3 backbone
 { rtr X.Y.0.3 E S 80023467 age 4
 } [|ospf] [tos 0xc0] [ttl 1] (id 35846)

Bird doesn't handle this setup....

bird> show ospf neighbors
MyOSPF:
Router ID       Pri          State      DTime   Interface  Router IP
X.Y.0.8        0         2way/other  00:32   eth0       X.Y.0.8
X.Y.0.3        0         init/other  00:39   eth0       X.Y.0.1
X.Y.0.7        0         2way/other  00:32   eth0       X.Y.0.7
X.Y.0.5      128         full/dr     00:39   eth0       X.Y.0.5
X.Y.0.4      128         full/bdr    00:39   eth0       X.Y.0.4
bird>

And in the logs

25-04-2010 17:58:03 <TRACE> MyOSPF:     LSA      Type: 0001, Id:
X.Y.0.3, Rt: X.Y.0.3, Age: 2, Seq: 80023552, Sum: 8856
     Working on router X.Y.0.3 Found :-)
     Next hop calculating for id: X.Y.0.3 rt: X.Y.0.3 type: 1
25-04-2010 17:58:05 <WARN> Cannot find next hop for LSA (Type: 0001, Id:
X.Y.0.3, Rt: X.Y.0.3)
     Working on router X.Y.0.3 Found :-)
     Next hop calculating for id: X.Y.0.3 rt: X.Y.0.3 type: 1

and

OSPF: RX hook called (iface eth0, src X.Y.0.2, dst 224.0.0.5)
25-04-2010 18:00:45 <TRACE> MyOSPF: HELLO packet received from X.Y.0.2
via eth0
Neighbor state machine for neighbor X.Y.0.1, event 'hello received'
Neighbor state machine for neighbor X.Y.0.1, event '1-way received'
Neighbor state machine for neighbor X.Y.0.1, event 'hello received'
MyOSPF: RXMT timer fired on interface eth0 for neigh: X.Y.0.1.
OSPF: RX hook called (iface eth0, src X.Y.0.1, dst 224.0.0.5)
25-04-2010 18:00:49 <TRACE> MyOSPF: HELLO packet received from X.Y.0.1
via eth0
Neighbor state machine for neighbor X.Y.0.1, event 'hello received'
Neighbor state machine for neighbor X.Y.0.1, event '1-way received'
Neighbor state machine for neighbor X.Y.0.1, event 'hello received'
MyOSPF: RXMT timer fired on interface eth0 for neigh: X.Y.0.1.

My guess is that neighbors are created based on their address
instead of their RID. Looking at the info below I'm guessing this is
not correct.

Can this be fixed?

from junos

epping at BR1> show ospf neighbor X.Y.0.3 extensive
Address          Interface              State     ID               Pri
Dead
X.Y.0.1       ge-0/0/0.0             Full      X.Y.0.3         0    32
  Area 0.0.0.0, opt 0x2, DR X.Y.0.5, BDR X.Y.0.4
  Up 00:24:38, adjacent 00:24:33
X.Y.0.2       ge-0/0/0.0             Full      X.Y.0.3         0    37
  Area 0.0.0.0, opt 0x2, DR X.Y.0.5, BDR X.Y.0.4
  Up 4d 05:22:13, adjacent 4d 05:22:13
    Link state retransmission list:

      Type      LSA ID           Adv rtr          Seq

     Router    X.Y.0.3       X.Y.0.3       0x8002349e


epping at BR1>

and IOS

BR3#sh ip ospf neighbor detail X.Y.0.3
 Neighbor X.Y.0.3, interface address X.Y.0.2
    In the area 0.0.0.0 via interface Ethernet0
    Neighbor priority is 0, State is 2WAY, 2 state changes
    DR is X.Y.0.5 BDR is X.Y.0.4
    Options 2
    Dead timer due in 00:00:30
 Neighbor X.Y.0.3, interface address X.Y.0.1
    In the area 0.0.0.0 via interface Ethernet0
    Neighbor priority is 0, State is 2WAY, 2 state changes
    DR is X.Y.0.5 BDR is X.Y.0.4
    Options 2
    Dead timer due in 00:00:35
BR3#

GRTNX,
RobJE
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