From: Tarun Pahuja (pahujat@gmail.com)
Date: Wed Jun 20 2007 - 09:39:49 ART
Eric,
The Source in the OSPF distance command should be the RID of the
preferred ABR in your case.
HTH,
Tarun Pahuja
CCIE#7707(R&S,Security,SP,Voice,Storage),CCSI
On 6/20/07, Antonio Soares <amsoares@netcabo.pt> wrote:
>
> Yes, it seems a Bug. Here's what i got:
>
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> R3#sh ip route ospf
> 1.0.0.0/32 is subnetted, 1 subnets
> O IA 1.1.1.1 [110/782] via 13.13.13.1, 00:00:07, Serial1/2
> 2.0.0.0/32 is subnetted, 1 subnets
> O IA 2.2.2.2 [110/782] via 23.23.23.2, 00:00:07, Serial1/3
> 12.0.0.0/24 is subnetted, 1 subnets
> O IA 12.12.12.0 [110/791] via 13.13.13.1, 00:00:07, Serial1/2
> [110/791] via 23.23.23.2, 00:00:07, Serial1/3
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> R3#sh ip ospf data
>
> OSPF Router with ID (3.3.3.3) (Process ID 1)
>
> Router Link States (Area 0)
>
> Link ID ADV Router Age Seq# Checksum Link count
> 1.1.1.1 1.1.1.1 366 0x80000005 0x004EED 2
> 2.2.2.2 2.2.2.2 334 0x80000002 0x00D920 2
> 3.3.3.3 3.3.3.3 334 0x80000004 0x00912F 4
>
> Summary Net Link States (Area 0)
>
> Link ID ADV Router Age Seq# Checksum
> 1.1.1.1 1.1.1.1 512 0x80000001 0x0047EC
> 1.1.1.1 2.2.2.2 335 0x80000001 0x008D98
> 2.2.2.2 1.1.1.1 512 0x80000001 0x007DA8
> 2.2.2.2 2.2.2.2 335 0x80000001 0x00FA31
> 12.12.12.0 1.1.1.1 512 0x80000001 0x001EEC
> 12.12.12.0 2.2.2.2 335 0x80000001 0x00FF07
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> R3#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> R3(config)#router ospf 1
> R3(config-router)# distance 101 1.1.1.1 0.0.0.0
> R3(config-router)#end
> R3#
> *Mar 1 00:25:19.358: %SYS-5-CONFIG_I: Configured from console by console
> R3#
> R3#sh ip route ospf
> 1.0.0.0/32 is subnetted, 1 subnets
> O IA 1.1.1.1 [101/782] via 13.13.13.1, 00:00:06, Serial1/2
> 2.0.0.0/32 is subnetted, 1 subnets
> O IA 2.2.2.2 [101/792] via 13.13.13.1, 00:00:06, Serial1/2
> 12.0.0.0/24 is subnetted, 1 subnets
> O IA 12.12.12.0 [101/791] via 13.13.13.1, 00:00:06, Serial1/2
> R3#
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> R3#
> R3#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> R3(config)#router ospf 1
> R3(config-router)#no distance 101 1.1.1.1 0.0.0.0
> R3(config-router)# distance 102 2.2.2.2 0.0.0.0
> R3(config-router)#
> R3(config-router)#end
> R3#
> *Mar 1 00:25:37.115: %SYS-5-CONFIG_I: Configured from console by console
> R3#sh ip route ospf
> 1.0.0.0/32 is subnetted, 1 subnets
> O IA 1.1.1.1 [110/782] via 13.13.13.1, 00:00:03, Serial1/2
> 2.0.0.0/32 is subnetted, 1 subnets
> O IA 2.2.2.2 [102/782] via 23.23.23.2, 00:00:03, Serial1/3
> 12.0.0.0/24 is subnetted, 1 subnets
> O IA 12.12.12.0 [102/791] via 23.23.23.2, 00:00:03, Serial1/3
> R3#
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
> -----Original Message-----
> From: Eric Poulin [mailto:epoulins@yahoo.com]
> Sent: terga-feira, 19 de Junho de 2007 23:45
> To: Marvin Greenlee; Antonio Soares; ccielab@groupstudy.com
> Subject: RE: I can't get the "distance <distance> <router-id> <acl>" to
> work
> in OSPF with multiple equal cost routes.
>
> The 150.1.1.1 and 150.1.2.2 are the advertising routers. Here's the output
> of show ip ospf database:
>
> Rack1R5#sh ip ospf data
>
> OSPF Router with ID (150.1.5.5) (Process ID 1)
>
> Router Link States (Area 1)
>
> Link ID ADV Router Age Seq# Checksum Link count
> 150.1.1.1 150.1.1.1 1489 0x80000011 0x0013C8 3
> 150.1.2.2 150.1.2.2 714 0x80000012 0x00EFCF 3
> 150.1.5.5 150.1.5.5 1709 0x8000000B 0x00FFF6 4
>
> Summary Net Link States (Area 1)
>
> Link ID ADV Router Age Seq# Checksum
> 139.1.0.0 150.1.1.1 1730 0x8000000A 0x00DBE7
> 139.1.0.0 150.1.2.2 1712 0x8000000A 0x00CEF2
> 139.1.2.0 150.1.1.1 1729 0x80000008 0x000DAF
> 139.1.2.0 150.1.2.2 1712 0x8000000A 0x00DB2D
> 139.1.6.0 150.1.1.1 1730 0x8000000A 0x00A319
> 139.1.6.0 150.1.2.2 1712 0x8000000A 0x009624
> 139.1.7.0 150.1.1.1 1730 0x8000000A 0x009823
> 139.1.7.0 150.1.2.2 1712 0x8000000A 0x008B2E
> 139.1.11.0 150.1.1.1 1730 0x8000000A 0x00857C
> 139.1.11.0 150.1.2.2 1713 0x80000008 0x009C15
> 139.1.13.0 150.1.1.1 1731 0x8000000B 0x00E5D9
> 139.1.13.0 150.1.2.2 1714 0x8000000A 0x007836
> 139.1.23.0 150.1.1.1 1732 0x8000000A 0x00178F
> 139.1.23.0 150.1.2.2 1714 0x8000000B 0x006A49
>
>
> --- Marvin Greenlee <marvin@ipexpert.com> wrote:
>
> > Looking at the output of show ip ospf database, are the 150.1.1.1 and
> > 150.1.2.2 the devices that are advertising the routes, or just your
> > local neighbors?
> >
> >
> >
> > Marvin Greenlee, CCIE #12237 (R&S, SP, Sec) Senior Technical
> > Instructor - IPexpert, Inc.
> > A Cisco Learning Partner - We Accept Learning Credits!
> > Telephone: +1.810.326.1444
> > Fax: +1.810.454.0130
> > Mailto: mgreenlee@ipexpert.com
> >
> > IPexpert - The Global Leader in Self-Study, Classroom-Based, Video
> > Class-On-Demand and Audio Certification Training Tools for the Cisco
> > CCIE R&S Lab, CCIE Security Lab, CCIE Service Provider Lab, CCIE Voice
> > Lab and CCIE Storage Lab Certifications.
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of Eric Poulin
> > Sent: Tuesday, June 19, 2007 4:35 PM
> > To: ccielab@groupstudy.com
> > Subject: I can't get the "distance <distance> <router-id> <acl>" to
> > work in OSPF with multiple equal cost routes.
> >
> > Hi GS,
> >
> > I don't understand what's going on, but I just can't get the "distance
> > <distance> <router-id> <acl>" to work in OSPF with multiple equal cost
> > routes. Here's the output of the routing table without any distance
> > manipulation:
> >
> > Rack1R5#show ip route ospf
> > 139.1.0.0/16 is variably subnetted, 14 subnets, 2 masks
> > O IA 139.1.11.0/24 [110/65] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.13.0/24 [110/128] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.2.0/24 [110/65] via 139.1.25.2, 00:11:27, Serial0/0.25
> > O IA 139.1.0.0/24 [110/138] via 139.1.25.2, 00:11:27, Serial0/0.25
> > [110/138] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.6.0/24 [110/139] via 139.1.25.2, 00:11:27, Serial0/0.25
> > [110/139] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.7.0/24 [110/139] via 139.1.25.2, 00:11:27, Serial0/0.25
> > [110/139] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.23.0/24 [110/128] via 139.1.25.2, 00:11:27, Serial0/0.25
> >
> > As you can see, I have a single route to network 11, 13 and 2 and two
> > equal-cost routes to network 0, 6, 7 and 23. Routes are learned either
> > via 139.1.15.1 (RID
> > 150.1.1.1) or
> > 139.1.25.2 (RID 150.1.2.2). Under the OSPF process, if I manipulate
> > the distance of network 11, 13 or 2 which I only have a single route,
> > everything works fine and I can change distance to whatever I want.
> > Here's an example:
> >
> > router ospf 1
> > distance 109 150.1.1.1 0.0.0.0 VLAN13
> >
> > ip access-list standard VLAN13
> > permit 139.1.13.0
> >
> > Rack1R5#show ip route ospf
> > 139.1.0.0/16 is variably subnetted, 14 subnets, 2 masks
> > O IA 139.1.11.0/24 [110/65] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.13.0/24 [109/128] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.2.0/24 [110/65] via 139.1.25.2, 00:11:27, Serial0/0.25
> > O IA 139.1.0.0/24 [110/138] via 139.1.25.2, 00:11:27, Serial0/0.25
> > [110/138] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.6.0/24 [110/139] via 139.1.25.2, 00:11:27, Serial0/0.25
> > [110/139] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.7.0/24 [110/139] via 139.1.25.2, 00:11:27, Serial0/0.25
> > [110/139] via 139.1.15.1, 00:11:27, Serial0/0.15
> > O IA 139.1.23.0/24 [110/128] via 139.1.25.2, 00:11:27, Serial0/0.25
> >
> >
> > Now here's the bug, if I try changing the distance of any equal-cost
> > routes, it does not work. Here's an example:
> >
> > router ospf 1
> > distance 109 150.1.1.1 0.0.0.0 VIA_R1
> >
> > ip access-list standard VIA_R1
> > permit 139.1.6.0
> > permit 139.1.7.0
> >
> > Rack1R5#show ip route ospf
> > 139.1.0.0/16 is variably subnetted, 14 subnets, 2 masks
> > O IA 139.1.11.0/24 [110/65] via 139.1.15.1, 00:00:11, Serial0/0.15
> > O IA 139.1.13.0/24 [110/128] via 139.1.15.1, 00:00:11, Serial0/0.15
> > O IA 139.1.2.0/24 [110/65] via 139.1.25.2, 00:00:11, Serial0/0.25
> > O IA 139.1.0.0/24 [110/138] via 139.1.25.2, 00:00:11, Serial0/0.25
> > [110/138] via 139.1.15.1, 00:00:11, Serial0/0.15
> > O IA 139.1.6.0/24 [110/139] via 139.1.25.2, 00:00:11, Serial0/0.25
> > [110/139] via 139.1.15.1, 00:00:11, Serial0/0.15
> > O IA 139.1.7.0/24 [110/139] via 139.1.25.2, 00:00:11, Serial0/0.25
> > [110/139] via 139.1.15.1, 00:00:11, Serial0/0.15
> > O IA 139.1.23.0/24 [110/128] via 139.1.25.2, 00:00:11, Serial0/0.25
> >
> >
> > After seeing that, I decided to eliminate the access-list and see what
> > happens when I change the distance for all routes learned from
> > 150.1.1.1:
> >
> > router ospf 1
> > distance 109 150.1.1.1 0.0.0.0
> >
> > Rack1R5#show ip route ospf
> > 139.1.0.0/16 is variably subnetted, 14 subnets, 2 masks
> > O IA 139.1.11.0/24 [109/65] via 139.1.15.1, 00:05:06, Serial0/0.15
> > O IA 139.1.13.0/24 [109/128] via 139.1.15.1, 00:05:06, Serial0/0.15
> > O IA 139.1.2.0/24 [110/65] via 139.1.25.2, 00:05:06, Serial0/0.25
> > O IA 139.1.0.0/24 [110/138] via 139.1.25.2, 00:05:06, Serial0/0.25
> > [110/138] via 139.1.15.1, 00:05:06, Serial0/0.15
> > O IA 139.1.6.0/24 [110/139] via 139.1.25.2, 00:05:06, Serial0/0.25
> > [110/139] via 139.1.15.1, 00:05:06, Serial0/0.15
> > O IA 139.1.7.0/24 [110/139] via 139.1.25.2, 00:05:06, Serial0/0.25
> > [110/139] via 139.1.15.1, 00:05:06, Serial0/0.15
> > O IA 139.1.23.0/24 [110/128] via 139.1.25.2, 00:05:06, Serial0/0.25
> >
> > None of the equal-cost routes changed, only the single route. This is
> > a very strange behavior, and I don't understand why. Can anyone
> > explain me why this is occuring?
> >
> > Thanks for your input,
> > Eric
> >
> >
> >
> > ______________________________________________________________________
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