From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Fri Aug 22 2003 - 12:36:09 GMT-3
Your dead timer is lower than the hello timer on the 189.18.110.0
network.
Do a "show ip ospf interface" and you'll see that the hello timer for
the point-to-multipoint interfaces is 30 seconds and you've set the dead
timer to 25 seconds. Unlike when setting the hello timer, when the dead
timer is manually set the hello timer is not automatically adjusted. If
you manually set the hello timer the dead timer, assuming it hasn't been
manually set, will automatically follow (4 times hello).
As a side note you have some extra routing protocol related commands
that aren't needed in your configuration.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com Toll Free: 877-334-8987
Direct: 775-745-6404 (Outside the US and Canada)
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Waheed Mir
Sent: Friday, August 22, 2003 12:33 AM
To: Waheed Mir; ccielab@groupstudy.com
Subject: Re: OSPF Virtual Link Flapping
Here are the configs....R2 the HUB and R4 and R6 SPOKES ...
-thanx
**********R2, R4 and R6 Configs****************
R2#
R2#sh run
R2#sh running-config
Building configuration...
Current configuration : 1600 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R2
!
!
!
!
!
!
ip subnet-zero
no ip domain-lookup
!
!
!
!
interface Loopback0
ip address 189.18.2.2 255.255.255.0
ip ospf network point-to-point
!
interface Ethernet0
no ip address
shutdown
!
interface Ethernet1
ip address 189.18.23.2 255.255.255.224
ip ospf priority 100
!
interface Serial0
no ip address
encapsulation frame-relay
frame-relay lmi-type ansi
!
interface Serial0.1 multipoint
ip address 189.18.110.2 255.255.255.248
ip ospf authentication message-digest
ip ospf network point-to-multipoint
ip ospf dead-interval 25
ip ospf priority 0
frame-relay map ip 189.18.110.4 204 broadcast
frame-relay map ip 189.18.110.6 206 broadcast
no frame-relay inverse-arp
!
interface Serial0.2 multipoint
ip address 189.18.100.2 255.255.255.248
ip ospf priority 0
frame-relay map ip 189.18.100.3 203 broadcast
frame-relay map ip 189.18.100.6 203
no frame-relay inverse-arp
!
interface Serial1
ip address 189.18.12.2 255.255.255.0
shutdown
!
router ospf 77
router-id 189.18.2.2
log-adjacency-changes
area 0 authentication message-digest
area 246 virtual-link 189.18.6.6 message-digest-key 1 md5 cisco
area 246 virtual-link 189.18.4.4 message-digest-key 1 md5 cisco
network 189.18.2.0 0.0.0.255 area 23
network 189.18.23.0 0.0.0.31 area 23
network 189.18.100.0 0.0.0.7 area 236
network 189.18.110.0 0.0.0.7 area 246
!
ip classless
ip http server
!
!
line con 0
exec-timeout 0 0
--More--
R4#sh running-config
Building configuration...
Current configuration : 1720 bytes
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R4
!
!
!
!
!
!
memory-size iomem 15
ip subnet-zero
no ip finger
no ip domain-lookup
!
!
!
!
!
!
!
!
interface Loopback0
ip address 189.18.4.4 255.255.255.0
ip ospf network point-to-point
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.45
encapsulation dot1Q 45
ip address 189.18.45.4 255.255.255.0
no ip redirects
ip ospf message-digest-key 1 md5 cisco
!
interface FastEthernet0/0.46
encapsulation dot1Q 46
ip address 171.89.18.4 255.255.255.0
no ip redirects
ip ospf message-digest-key 1 md5 cisco
!
interface Serial0/0
ip address 189.18.110.4 255.255.255.248
encapsulation frame-relay
ip split-horizon
ip ospf authentication message-digest
ip ospf network point-to-multipoint
ip ospf dead-interval 25
ip ospf priority 0
no fair-queue
frame-relay map ip 189.18.110.6 402
frame-relay map ip 189.18.110.2 402 broadcast
no frame-relay inverse-arp
frame-relay lmi-type ansi
!
interface FastEthernet0/1
ip address 189.18.44.4 255.255.255.0
ip ospf message-digest-key 1 md5 cisco
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
!
router ospf 77
--More--
router-id 189.18.4.4
log-adjacency-changes
area 0 authentication message-digest
area 246 virtual-link 189.18.2.2 message-digest-key 1 md5 cisco
network 171.89.18.0 0.0.0.255 area 0
network 189.18.4.0 0.0.0.255 area 246
network 189.18.44.0 0.0.0.255 area 0
network 189.18.45.0 0.0.0.255 area 0
network 189.18.110.0 0.0.0.7 area 246
!
ip classless
ip http server
!
-------
R6#sh running-config
Building configuration...
Current configuration : 1900 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R6
!
!
username R3 password 0 cisco
ip subnet-zero
no ip domain-lookup
!
isdn switch-type basic-net3
!
!
!
interface Loopback0
ip address 189.18.6.6 255.255.255.0
ip ospf network point-to-point
!
interface Ethernet0
ip address 171.89.18.6 255.255.255.0
ip ospf message-digest-key 1 md5 cisco
ip ospf priority 100
!
interface Serial0
no ip address
encapsulation frame-relay
frame-relay lmi-type ansi
!
interface Serial0.1 multipoint
ip address 189.18.110.6 255.255.255.248
ip ospf authentication message-digest
ip ospf network point-to-multipoint
ip ospf dead-interval 25
ip ospf priority 0
frame-relay map ip 189.18.110.4 602
frame-relay map ip 189.18.110.2 602 broadcast
no frame-relay inverse-arp
!
interface Serial0.2 multipoint
ip address 189.18.100.6 255.255.255.248
ip ospf priority 0
frame-relay map ip 189.18.100.2 603
frame-relay map ip 189.18.100.3 603 broadcast
no frame-relay inverse-arp
!
interface Serial1
no ip address
shutdown
!
interface BRI0
ip address 189.18.36.2 255.255.255.252
encapsulation ppp
shutdown
dialer idle-timeout 0
dialer map ip 189.18.36.1 name R3 broadcast
dialer load-threshold 1 either
dialer-group 1
isdn switch-type basic-ni
no cdp enable
ppp authentication chap
ppp multilink
!
router ospf 77
router-id 189.18.6.6
log-adjacency-changes
area 0 authentication message-digest
area 246 virtual-link 189.18.2.2 message-digest-key 1 md5 cisco
network 171.89.18.0 0.0.0.255 area 0
network 189.18.6.0 0.0.0.255 area 236
network 189.18.36.0 0.0.0.3 area 236
network 189.18.100.0 0.0.0.7 area 236
network 189.18.110.0 0.0.0.7 area 246
!
ip classless
ip http server
Waheed Mir <ccnp2ccie@yahoo.com> wrote:
Hi,
I'm using md5 authentication for virual links across transit area over
NBMA, but i cannot figure out why my Virual Links are flapping.. Please
see the event trace below..
-thanx
WAM
01:34:45: %OSPF-5-ADJCHG: Process 77, Nbr 189.18.2.2 on Serial0/0 from
FULL to DOWN, Neighbor Down: Dead timer expired
01:34:52: %OSPF-5-ADJCHG: Process 77, Nbr 189.18.2.2 on Serial0/0 from
LOADING to FULL, Loading Done
01:35:03: %OSPF-5-ADJCHG: Process 77, Nbr 189.18.2.2 on OSPF_VL0 from
LOADING to FULL, Loading Done
R4#sh ip ospf virtual-links
Virtual Link OSPF_VL0 to router 189.18.2.2 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 246, via interface Serial0/0, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:08
Adjacency State FULL (Hello suppressed)
Index 2/3, retransmission queue length 0, number of retransmission 16
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 5
Last retransmission scan time is 0 msec, maximum is 0 msec
Message digest authentication enabled
Youngest key id is 1
R4#
01:35:45: %OSPF-5-ADJCHG: Process 77, Nbr 189.18.2.2 on Serial0/0 from
FULL to DOWN, Neighbor Down: Dead timer expired
01:35:52: %OSPF-5-ADJCHG: Process 77, Nbr 189.18.2.2 on Serial0/0 from
LOADING to FULL, Loading Done
R4#sh ip ospf virtual-links
Virtual Link OSPF_VL0 to router 189.18.2.2 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 246, via interface Serial0/0, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:07
Adjacency State FULL (Hello suppressed)
Index 2/3, retransmission queue length 6, number of retransmission 17
First 0x81941A30(1874)/0x0(0) Next 0x8194122C(1879)/0x0(0)
Last retransmission scan length is 5, maximum is 5
Last retransmission scan time is 0 msec, maximum is 0 msec
Link State retransmission due in 20 msec
Message digest authentication enabled
Youngest key id is 1
R4#
01:36:03: %OSPF-5-ADJCHG: Process 77, Nbr 189.18.2.2 on OSPF_VL0 from
LOADING to FULL, Loading Done
---------------------------------
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This archive was generated by hypermail 2.1.4 : Tue Sep 02 2003 - 18:54:04 GMT-3