Re: OSPF Neighbor State is Flapping [7:72874]
Figured it out... It was an mtu mismatch ( router e0 mtu 1500, cat vlan15 mtu 1518 ). A deb ip ospf adj on r1 revealed the problem. Since changing mtu on lan interface is not possible in IOS...the interface command ip ospf mtu-ignore allowed OSPF to deal with the mismatch and just form the adjacency. The cisco url is:www.cisco.com/warp/public/104/12.pdf Thanks anyway! Dain Dain Deutschman wrote in message news:[EMAIL PROTECTED] Hi all, I have 3 devices on an ethernet segment where all ethernet interfaces are in the same vlan and ospf area 0 catalyst 3550priority 0rid 1.1.1.1 router5priority 2 rid 55.55.55.55BDR router1priority 3 rid 11.11.11.11DR The problem is that the switch keeps changing it's state. For example, from the router 1 perspective I get the following: ( sh ip ospf nei command ) Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 DOWN/DROTHER -150.50.15.8 Ethernet0 55.55.55.55 2 FULL/BDR00:00:35150.50.15.5 Ethernet0 Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 EXSTART/DROTHER 00:00:35150.50.15.8 Ethernet0 55.55.55.55 2 FULL/BDR00:00:38150.50.15.5 Ethernet0 and on and on, back and forth etc. router 5 perspective: Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 EXSTART/DROTHER 00:00:38150.50.15.8 Ethernet0/0 11.11.11.11 3 FULL/DR 00:00:30150.50.15.1 Ethernet0/0 Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 DOWN/DROTHER -150.50.15.8 Ethernet0/0 11.11.11.11 3 FULL/DR 00:00:32150.50.15.1 Ethernet0/0 ..switch perspective: Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 INIT/DROTHER00:00:33150.50.15.5 Vlan15 11.11.11.11 3 INIT/DROTHER00:00:39150.50.15.1 Vlan15 Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 INIT/DROTHER00:00:37150.50.15.5 Vlan15 11.11.11.11 3 EXCHANGE/DR 00:00:36150.50.15.1 Vlan15 Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 EXCHANGE/BDR00:00:39150.50.15.5 Vlan15 11.11.11.11 3 EXCHANGE/DR 00:00:39150.50.15.1 Vlan15 So...it seems as though r1 and r5 are recognizing eachother's roles as dr and bdr correctly. But they see the switch as down or init or exchange DROTHER. The switch however, sees itelf as DROTHER and r1/r5 as DROTHER or init/exchange dr and bdr. Here is the output from sh ip ospf int vlan15 on the switch: Vlan15 is up, line protocol is up Internet Address 150.50.15.8/24, Area 0 Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DROTHER, Priority 0 No designated router on this network No backup designated router on this network Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:07 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 2, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) Then two seconds laterit changes... Vlan15 is up, line protocol is up Internet Address 150.50.15.8/24, Area 0 Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DROTHER, Priority 0 Designated Router (ID) 11.11.11.11, Interface address 150.50.15.1 Backup Designated router (ID) 55.55.55.55, Interface address 150.50.15.5 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:05 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 2, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) Any ideas? Thanks, -- Dain Deutschman CCNP, CSS-1, MCP, CNA Data Communications Manager New Star Sales and Service, Inc. -- Dain Deutschman CCNP, CSS-1, MCP, CNA Data Communications Manager New Star Sales and Service, Inc. 800.261.0475 [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=72877t=72874 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: OSPF Neighbor State is Flapping [7:72874]
do the mtus all match? do big packets get through? /thomas Hi all, I have 3 devices on an ethernet segment where all ethernet interfaces are in the same vlan and ospf area 0 catalyst 3550priority 0rid 1.1.1.1 router5priority 2 rid 55.55.55.55BDR router1priority 3 rid 11.11.11.11DR The problem is that the switch keeps changing it's state. For example, from the router 1 perspective I get the following: ( sh ip ospf nei command ) Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 DOWN/DROTHER -150.50.15.8 Ethernet0 55.55.55.55 2 FULL/BDR00:00:35150.50.15.5 Ethernet0 Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 EXSTART/DROTHER 00:00:35150.50.15.8 Ethernet0 55.55.55.55 2 FULL/BDR00:00:38150.50.15.5 Ethernet0 and on and on, back and forth etc. router 5 perspective: Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 EXSTART/DROTHER 00:00:38150.50.15.8 Ethernet0/0 11.11.11.11 3 FULL/DR 00:00:30150.50.15.1 Ethernet0/0 Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 DOWN/DROTHER -150.50.15.8 Ethernet0/0 11.11.11.11 3 FULL/DR 00:00:32150.50.15.1 Ethernet0/0 ..switch perspective: Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 INIT/DROTHER00:00:33150.50.15.5 Vlan15 11.11.11.11 3 INIT/DROTHER00:00:39150.50.15.1 Vlan15 Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 INIT/DROTHER00:00:37150.50.15.5 Vlan15 11.11.11.11 3 EXCHANGE/DR 00:00:36150.50.15.1 Vlan15 Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 EXCHANGE/BDR00:00:39150.50.15.5 Vlan15 11.11.11.11 3 EXCHANGE/DR 00:00:39150.50.15.1 Vlan15 So...it seems as though r1 and r5 are recognizing eachother's roles as dr and bdr correctly. But they see the switch as down or init or exchange DROTHER. The switch however, sees itelf as DROTHER and r1/r5 as DROTHER or init/exchange dr and bdr. Here is the output from sh ip ospf int vlan15 on the switch: Vlan15 is up, line protocol is up Internet Address 150.50.15.8/24, Area 0 Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DROTHER, Priority 0 No designated router on this network No backup designated router on this network Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:07 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 2, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) Then two seconds laterit changes... Vlan15 is up, line protocol is up Internet Address 150.50.15.8/24, Area 0 Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DROTHER, Priority 0 Designated Router (ID) 11.11.11.11, Interface address 150.50.15.1 Backup Designated router (ID) 55.55.55.55, Interface address 150.50.15.5 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:05 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 2, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) Any ideas? Thanks, -- Dain Deutschman CCNP, CSS-1, MCP, CNA Data Communications Manager New Star Sales and Service, Inc. -- Dain Deutschman CCNP, CSS-1, MCP, CNA Data Communications Manager New Star Sales and Service, Inc. 800.261.0475 [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=72881t=72874 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
OSPF Neighbor State is Flapping [7:72874]
Hi all, I have 3 devices on an ethernet segment where all ethernet interfaces are in the same vlan and ospf area 0 catalyst 3550priority 0rid 1.1.1.1 router5priority 2 rid 55.55.55.55BDR router1priority 3 rid 11.11.11.11DR The problem is that the switch keeps changing it's state. For example, from the router 1 perspective I get the following: ( sh ip ospf nei command ) Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 DOWN/DROTHER -150.50.15.8 Ethernet0 55.55.55.55 2 FULL/BDR00:00:35150.50.15.5 Ethernet0 Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 EXSTART/DROTHER 00:00:35150.50.15.8 Ethernet0 55.55.55.55 2 FULL/BDR00:00:38150.50.15.5 Ethernet0 ..and on and on, back and forth etc. router 5 perspective: Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 EXSTART/DROTHER 00:00:38150.50.15.8 Ethernet0/0 11.11.11.11 3 FULL/DR 00:00:30150.50.15.1 Ethernet0/0 Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 DOWN/DROTHER -150.50.15.8 Ethernet0/0 11.11.11.11 3 FULL/DR 00:00:32150.50.15.1 Ethernet0/0 .switch perspective: Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 INIT/DROTHER00:00:33150.50.15.5 Vlan15 11.11.11.11 3 INIT/DROTHER00:00:39150.50.15.1 Vlan15 Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 INIT/DROTHER00:00:37150.50.15.5 Vlan15 11.11.11.11 3 EXCHANGE/DR 00:00:36150.50.15.1 Vlan15 Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 EXCHANGE/BDR00:00:39150.50.15.5 Vlan15 11.11.11.11 3 EXCHANGE/DR 00:00:39150.50.15.1 Vlan15 So...it seems as though r1 and r5 are recognizing eachother's roles as dr and bdr correctly. But they see the switch as down or init or exchange DROTHER. The switch however, sees itelf as DROTHER and r1/r5 as DROTHER or init/exchange dr and bdr. Here is the output from sh ip ospf int vlan15 on the switch: Vlan15 is up, line protocol is up Internet Address 150.50.15.8/24, Area 0 Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DROTHER, Priority 0 No designated router on this network No backup designated router on this network Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:07 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 2, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) Then two seconds laterit changes... Vlan15 is up, line protocol is up Internet Address 150.50.15.8/24, Area 0 Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DROTHER, Priority 0 Designated Router (ID) 11.11.11.11, Interface address 150.50.15.1 Backup Designated router (ID) 55.55.55.55, Interface address 150.50.15.5 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:05 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 2, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) Any ideas? Thanks, -- Dain Deutschman CCNP, CSS-1, MCP, CNA Data Communications Manager New Star Sales and Service, Inc. -- Dain Deutschman CCNP, CSS-1, MCP, CNA Data Communications Manager New Star Sales and Service, Inc. 800.261.0475 [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=72913t=72874 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
OSPF Neighbor State is Flapping [7:72874]
Hi all, I have 3 devices on an ethernet segment where all ethernet interfaces are in the same vlan and ospf area 0 catalyst 3550priority 0rid 1.1.1.1 router5priority 2 rid 55.55.55.55BDR router1priority 3 rid 11.11.11.11DR The problem is that the switch keeps changing it's state. For example, from the router 1 perspective I get the following: ( sh ip ospf nei command ) Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 DOWN/DROTHER -150.50.15.8 Ethernet0 55.55.55.55 2 FULL/BDR00:00:35150.50.15.5 Ethernet0 Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 EXSTART/DROTHER 00:00:35150.50.15.8 Ethernet0 55.55.55.55 2 FULL/BDR00:00:38150.50.15.5 Ethernet0 and on and on, back and forth etc. router 5 perspective: Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 EXSTART/DROTHER 00:00:38150.50.15.8 Ethernet0/0 11.11.11.11 3 FULL/DR 00:00:30150.50.15.1 Ethernet0/0 Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 DOWN/DROTHER -150.50.15.8 Ethernet0/0 11.11.11.11 3 FULL/DR 00:00:32150.50.15.1 Ethernet0/0 ..switch perspective: Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 INIT/DROTHER00:00:33150.50.15.5 Vlan15 11.11.11.11 3 INIT/DROTHER00:00:39150.50.15.1 Vlan15 Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 INIT/DROTHER00:00:37150.50.15.5 Vlan15 11.11.11.11 3 EXCHANGE/DR 00:00:36150.50.15.1 Vlan15 Neighbor ID Pri State Dead Time Address Interface 55.55.55.55 2 EXCHANGE/BDR00:00:39150.50.15.5 Vlan15 11.11.11.11 3 EXCHANGE/DR 00:00:39150.50.15.1 Vlan15 So...it seems as though r1 and r5 are recognizing eachother's roles as dr and bdr correctly. But they see the switch as down or init or exchange DROTHER. The switch however, sees itelf as DROTHER and r1/r5 as DROTHER or init/exchange dr and bdr. Here is the output from sh ip ospf int vlan15 on the switch: Vlan15 is up, line protocol is up Internet Address 150.50.15.8/24, Area 0 Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DROTHER, Priority 0 No designated router on this network No backup designated router on this network Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:07 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 2, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) Then two seconds laterit changes... Vlan15 is up, line protocol is up Internet Address 150.50.15.8/24, Area 0 Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DROTHER, Priority 0 Designated Router (ID) 11.11.11.11, Interface address 150.50.15.1 Backup Designated router (ID) 55.55.55.55, Interface address 150.50.15.5 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:05 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 2, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) Any ideas? Thanks, -- Dain Deutschman CCNP, CSS-1, MCP, CNA Data Communications Manager New Star Sales and Service, Inc. -- Dain Deutschman CCNP, CSS-1, MCP, CNA Data Communications Manager New Star Sales and Service, Inc. 800.261.0475 [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=72874t=72874 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
