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Webcast-Catalyst9k
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question about using "ip ospf demand circuit"

Hi All,

When using "ip ospf deman circuit", must I also not use "broadcast" parameter in the "dialer map " command in bri interface? I hear that the " broadcast" parameter will make the circuit up even if there is no topology change. Anybody has idea? Thank You!

Best Regards

Teru Lei

1 ACCEPTED SOLUTION

Accepted Solutions
Silver

Re: question about using "ip ospf demand circuit"

On broadcast media OSPF demand circuits will not successfully suppress the Hello's, it will only work successfully on point-to-point networks and point-to-multipoint non-broadcast networks

You need to use the IP OSPF NETWORK NON-BROADCAST command to change the interface to a non broadcast media on ISDN or configure it as a point-point interface

The following URL has some good tips on the use of OSPF demand circuits and reasons why the link may stay up - incluing the use of broadcast on ISDN configs:

http://www.cisco.com/en/US/customer/tech/tk826/tk365/technologies_tech_note09186a008009481b.shtml

2 REPLIES
Silver

Re: question about using "ip ospf demand circuit"

On broadcast media OSPF demand circuits will not successfully suppress the Hello's, it will only work successfully on point-to-point networks and point-to-multipoint non-broadcast networks

You need to use the IP OSPF NETWORK NON-BROADCAST command to change the interface to a non broadcast media on ISDN or configure it as a point-point interface

The following URL has some good tips on the use of OSPF demand circuits and reasons why the link may stay up - incluing the use of broadcast on ISDN configs:

http://www.cisco.com/en/US/customer/tech/tk826/tk365/technologies_tech_note09186a008009481b.shtml

Bronze

Re: question about using "ip ospf demand circuit"

Hi Teru Lei

There is an issue about broadcast and demand circuit but it think it's not the

broadcast in the dialer map.

As i rememeber it's the ospf interface typ which should not be broadcast.

If you type "sh ip ospf interface" it will show you the ospf network type.

1600#sh ip ospf interface

Serial0 is up, line protocol is up

Internet Address 10.0.0.2/30, Area 0

Process ID 1, Router ID 20.20.20.20, Network Type POINT_TO_POINT,

Cost:64

Transmit Delay is 1 sec, State POINT_TO_POINT,

Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

Hello due in 00:00:09

Index 1/1, flood queue length 0

Next 0x0(0)/0x0(0)

Last flood scan length is 0, maximum is 0

Last flood scan time is 0 msec, maximum is 0 msec

Neighbor Count is 0, Adjacent neighbor count is 0

Suppress hello for 0 neighbor(s)

You can change the type with "ip ospt network " on the interface level.

Hope that helps you.

Roger

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