From: Joseph Saad (joseph.s.saad@gmail.com)
Date: Sat Jul 28 2007 - 12:14:04 ART
To start, I am using Dynamips till I get my faulty FR Switch replaced.
I read all the posts and documents and when it comes to OSPF over FR the
default IP OSPF network type is "NON_Broadcast".
Here's the case. I have built an FR network:
Hub & 2 spokes.
All supports broadcasts.
No use of inverse ARP.
All on Physical interfaces and using static frame map ip statements.
The instructions are that I should configure the interface as "ip ospf
network broadcast", but I didn't.
I didn't configure "Neighbor" also on any of the 3 routers.
To my surprise, the neighbors were discovered and after a minute adjacencies
went into FULL including the DR election.
Here's the relevant config. And I appreciate if somebody can tell me why
this behavior is occurring?
Note (R1) is the hub. R4 and R5 are spokes.
Rack1RX#sh ver | in Version
Cisco IOS Software, 3600 Software (C3640-JS-M), Version 12.4(12), RELEASE
SOFTWARE (fc1)
!!!!!!!!!!R1
Rack1R1#sh run int s1/0
!
interface Serial1/0
ip address 10.0.0.1 255.0.0.0
encapsulation frame-relay
serial restart-delay 0
frame-relay map ip 10.0.0.4 104 broadcast
frame-relay map ip 10.0.0.5 105 broadcast
no frame-relay inverse-arp
end
Rack1R1#sh runn | b router ospf
router ospf 1
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 0
Rack1R1#sh ip ospf ne
Neighbor ID Pri State Dead Time Address Interface
10.0.0.4 0 FULL/DROTHER 00:01:30 10.0.0.4 Serial1/0
10.0.0.5 0 FULL/DROTHER 00:01:33 10.0.0.5 Serial1/0
Rack1R1#sh ip ospf int s1/0
Serial1/0 is up, line protocol is up
Internet Address 10.0.0.1/8, Area 0
Process ID 1, Router ID 10.0.0.1, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.0.0.1, Interface address 10.0.0.1
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:29
!!!!!!!!!!!!!R4
Rack1R4#sh runn int s1/0
!
interface Serial1/0
ip address 10.0.0.4 255.0.0.0
encapsulation frame-relay
ip ospf priority 0
frame-relay map ip 10.0.0.1 401 broadcast
frame-relay map ip 10.0.0.5 401
no frame-relay inverse-arp
end
Rack1R4#sh runn | b router ospf 1
router ospf 1
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 0
!
Rack1R4#sh ip ospf int s1/0
Serial1/0 is up, line protocol is up
Internet Address 10.0.0.4/8, Area 0
Process ID 1, Router ID 10.0.0.4, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 10.0.0.1, Interface address 10.0.0.1
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
.
.
.
Adjacent with neighbor 10.0.0.1 (Designated Router)
Suppress hello for 0 neighbor(s)
Rack1R4#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.0.0.1 1 FULL/DR 00:01:33 10.0.0.1 Serial1/0
!!!!!!!!!!!!!!!R5
Rack1R5#sh runn int s1/0
!
interface Serial1/0
ip address 10.0.0.5 255.0.0.0
encapsulation frame-relay
ip ospf priority 0
frame-relay map ip 10.0.0.1 501 broadcast
frame-relay map ip 10.0.0.4 501
no frame-relay inverse-arp
end
Rack1R5#sh runn | b router ospf 1
router ospf 1
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 0
Serial1/0 is up, line protocol is up
Internet Address 10.0.0.5/8, Area 0
Process ID 1, Router ID 10.0.0.5, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 10.0.0.1, Interface address 10.0.0.1
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
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