From: Thomwin Chen (thomwin_chen@yahoo.com)
Date: Sat Jul 30 2005 - 11:52:33 GMT-3
Hi Gustavo,
neighbor x.x.x.x priority y
y value is taken from ip ospf priority set on the neighbor
rgds,
Thomwin
Gustavo Novais <gustavo.novais@novabase.pt> wrote:
Hello,
I was trying to review the basics and attempted to do a hub and spoke
topology involving router R2 as hub and R4,R5 and R6 as spokes on a NBMA
environment, with neighbor defined and such.
My config on the hub was
interface Serial0/0
ip address 150.50.100.2 255.255.255.0
encapsulation frame-relay
clockrate 256000
no arp frame-relay
frame-relay map ip 150.50.100.2 204
frame-relay map ip 150.50.100.4 204 tcp header-compression
frame-relay map ip 150.50.100.5 205
frame-relay map ip 150.50.100.6 206
no frame-relay inverse-arp
end
I set router ospf with spokes with priority 0 making R2 DR
R2(config-router)#neighbor 150.50.100.4 priority 0
R2(config-router)#neighbor 150.50.100.5 priority 0
R2(config-router)#neighbor 150.50.100.6 priority 0
R2(config-router)#
R2(config-router)#
R2(config-router)#
R2(config-router)#^Z
R2#
R2#
R2#
R2#
R2#
R2#
R2#
R2#
*Mar 1 00:51:05.483: %SYS-5-CONFIG_I: Configured from console by
consolesh run | b r o
router ospf 1
log-adjacency-changes
area 1 nssa default-information-originate
area 1 nssa translate type7 suppress-fa
network 150.50.2.2 0.0.0.0 area 0
network 150.50.10.0 0.0.0.255 area 1
network 150.50.100.0 0.0.0.255 area 0
network 150.50.101.4 0.0.0.3 area 0
neighbor 150.50.100.4
neighbor 150.50.100.5
neighbor 150.50.100.6
On the spokes, I did
interface Serial0/0
ip address 150.50.100.4 255.255.255.0
encapsulation frame-relay
clockrate 256000
no arp frame-relay
frame-relay map ip 150.50.100.2 402 tcp header-compression
frame-relay map ip 150.50.100.4 402
frame-relay map ip 150.50.100.5 402
frame-relay map ip 150.50.100.6 402
no frame-relay inverse-arp
!
R4#sh run | b r o
router ospf 1
log-adjacency-changes
area 4 stub
network 150.50.4.4 0.0.0.0 area 0
network 150.50.40.0 0.0.0.255 area 4
network 150.50.100.0 0.0.0.255 area 0
neighbor 150.50.100.2 priority 100
!
The strange thing to me, is that after election R6 (highest RID) was
elected, and configurations on running were updated automatically!
after election we have on spoke:
router ospf 1
log-adjacency-changes
area 4 stub
network 150.50.4.4 0.0.0.0 area 0
network 150.50.40.0 0.0.0.255 area 4
network 150.50.100.0 0.0.0.255 area 0
neighbor 150.50.100.2 priority 1
<-------------------------------------------WAS 100
!
and on hub
router ospf 1
log-adjacency-changes
area 1 nssa default-information-originate
area 1 nssa translate type7 suppress-fa
network 150.50.2.2 0.0.0.0 area 0
network 150.50.10.0 0.0.0.255 area 1
network 150.50.100.0 0.0.0.255 area 0
network 150.50.101.4 0.0.0.3 area 0
neighbor 150.50.100.4 priority 1
<---------------------------------------- I set it to 0 earlier
neighbor 150.50.100.5 priority 1
<---------------------------------------- I set it to 0 earlier
neighbor 150.50.100.6 priority 1
<---------------------------------------- I set it to 0 earlier
!
R2#sh ip ospf interface ser0/0
Serial0/0 is up, line protocol is up
Internet Address 150.50.100.2/24, Area 0
Process ID 1, Router ID 150.50.2.2, Network Type NON_BROADCAST, Cost:
64
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 150.50.6.6, Interface address 150.50.100.6
Backup Designated router (ID) 150.50.2.2, Interface address
150.50.100.2
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:25
Index 2/3, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 4
Last flood scan time is 0 msec, maximum is 4 msec
Neighbor Count is 3, Adjacent neighbor count is 3
Adjacent with neighbor 150.50.4.4
Adjacent with neighbor 150.50.5.5
Adjacent with neighbor 150.50.6.6 (Designated Router)
Suppress hello for 0 neighbor(s)
R2#
I'm running version IOS (tm) C2600 Software (C2600-JK9O3S-M), Version
12.2(15)T16, RELEASE SOFTWARE (fc2)
c2600-jk9o3s-mz.122-15.T16.bin
Has anybody ever faced this behaviour? Is it usual? Am I missing
something here? Usually we go for point-to-point or broadcast or
something else than NBMA but in deed I'd like to try it. I'm getting
confused.
This archive was generated by hypermail 2.1.4 : Sun Sep 04 2005 - 17:00:32 GMT-3