19-20 ip ospf transmit-delay seconds

19-20 ip ospf transmit-delay seconds

Syntax Description:

• seconds ” The range of values is 1 to 8192 seconds. The default value is 1 second.

Purpose: When an LSA is created, the router sets the LS age field to 0. The transmit delay value is added to the age field of the LSA. This initial value represents the time delay of propagating the LSA over the interface.

Initial Cisco IOS Software Release: 10.0

Configuration Example: Modifying the Transmit Delay Value for an OSPF Interface

Configure the network in Figure 19-16 and set the transmit delay value on Router A to 2 seconds.

Figure 19-16. Transmit Delay Represents the LSA Propagation Delay Over an OSPF Interface

 Router A  interface Loopback0   ip address 1.1.1.1 255.255.255.255   !   interface Serial0/1   bandwidth 64   ip address 10.1.1.1 255.255.255.252    ip ospf transmit-delay 2    clockrate 64000   !   router ospf 1   network 1.1.1.1 0.0.0.0 area 1   network 10.1.1.0 0.0.0.3 area 0  ____________________________________________________________________________ Router B  interface Loopback0   ip address 2.2.2.2 255.255.255.255   !   interface Serial0   ip address 10.1.1.2 255.255.255.252   bandwidth 64   !   router ospf 1   network 2.2.2.2 0.0.0.0 area 2   network 10.1.1.0 0.0.0.3 area 0  

Verification

Verify that the transmit delay value has been modified, that the OSPF neighbor relationship is active, and that all OSPF routes are being exchanged.

 rtrA#  show ip ospf interface serial 0/1  Serial0/1 is up, line protocol is up   Internet Address 10.1.1.1/30, Area 0   Process ID 1, Router ID 1.1.1.1, Network Type POINT_TO_POINT, Cost: 1562  Transmit Delay is 2 sec  , State POINT_TO_POINT,   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5     Hello due in 00:00:00   Index 1/1, flood queue length 0   Next 0x0(0)/0x0(0)   Last flood scan length is 2, maximum is 2   Last flood scan time is 0 msec, maximum is 0 msec   Neighbor Count is 1, Adjacent neighbor count is 1     Adjacent with neighbor 2.2.2.2   Suppress hello for 0 neighbor(s) rtrA#  show ip ospf neighbor  Neighbor ID     Pri   State           Dead Time   Address         Interface 2.2.2.2           1  FULL/  -  00:00:36    10.1.1.2        Serial0/1 rtrA#  show ip route  Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP        D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area        N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2        E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP        i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area        * - candidate default, U - per-user static route, o - ODR        P - periodic downloaded static route Gateway of last resort is not set      1.0.0.0/32 is subnetted, 1 subnets C       1.1.1.1 is directly connected, Loopback0      2.0.0.0/32 is subnetted, 1 subnets O IA    2.2.2.2 [110/1563] via 10.1.1.2, 00:40:39, Serial0/1      10.0.0.0/30 is subnetted, 1 subnets C       10.1.1.0 is directly connected, Serial0/1 

Troubleshooting

Step 1. Verify that there is a neighbor relationship between the OSPF routers by using the show ip ospf neighbor command.

Step 2. Verify that the desired transmit delay value has been configured by using the OSPF interface command ip ospf transmit-delay.