multiple OSPF processes and Cisco 3750

Muhammad Khan · ‎10-17-2011

I have a 3750 switch stack (Z) at a remote site connected to two 6500 switches (R and P) at two locations over P2P links. I am running multiple OSPF proceses on R and P. I can see the ospf neighorship being established on all switches (R,P,Z) and I can see switch Z receiving routes from switch R but I do not see any routes being advertised by Z towards R. Z is advertising routes to P fine. (Please see the attachments for design and config)

Could anyone suggest anything? Could this be related to IOS version/licening on 3750s? Following is the licening information fro 3750s

Switch Ports Model SW Version SW Image

------ ----- ----- ---------- ----------

* 1 54 WS-C3750E-48PD 12.2(35)SE5 C3750E-UNIVERSAL-M

2 54 WS-C3750E-48PD 12.2(35)SE5 C3750E-UNIVERSAL-M

License Level : ipservices

License Type : Permanent

Thanks,

ankugarg · ‎10-17-2011

This shouldn't be license related,i guess...If something is not available on a particular license,switch will not even allow you to configure that.

Vaibhava Varma · ‎10-17-2011

Hi Muhammad

So here Switch P is receiving the route 192.168.0.0/16 from Switch Z fine but Switch R is not receiving

the route 192.168.0.0/16 from Switch Z. is that correct. How is the OSPF Database looking on Switch R & P.

Can you please share ouput of below on Switch R & P to look further:

sh ip route ospf

sh ip ospf database advertising router 1.1.1.1

sh ip ospf database router advertising router 1.1.1.1

Regards

Varma

Muhammad Khan · ‎10-17-2011

Hi Verma,

Output as requested

R#sh ip route ospf 60

R#sh ip ospf database adv-router 1.1.1.1

OSPF Router with ID (192.168.174.5) (Process ID 60)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 455 0x800000BE 0x00762A 6

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum
172.16.253.62 1.1.1.1 455 0x80000038 0x00F716

OSPF Router with ID (192.168.174.5) (Process ID 1)

R#sh ip ospf database router adv-router 1.1.1.1

OSPF Router with ID (192.168.174.5) (Process ID 60)

Router Link States (Area 0)

LS age: 606
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 1.1.1.1
Advertising Router: 1.1.1.1
LS Seq Number: 800000BE
Checksum: 0x762A
Length: 96
Number of Links: 6

    Link connected to: a Stub Network
     (Link ID) Network/subnet number: x.x.x.x
     (Link Data) Network Mask: 255.255.255.0
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

    Link connected to: a Stub Network
     (Link ID) Network/subnet number: x.x.x.x
     (Link Data) Network Mask: 255.255.254.0
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

    Link connected to: a Stub Network
     (Link ID) Network/subnet number: 192.168.0.0
     (Link Data) Network Mask: 255.255.255.0
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

    Link connected to: a Transit Network
     (Link ID) Designated Router address: 172.16.253.69
     (Link Data) Router Interface address: 172.16.253.70
      Number of TOS metrics: 0
       TOS 0 Metrics: 300

    Link connected to: a Transit Network
     (Link ID) Designated Router address: 172.16.253.62
     (Link Data) Router Interface address: 172.16.253.62
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

OSPF Router with ID (192.168.174.5) (Process ID 1)

====================================================

P#sh ip route ospf 60
     x.x.0.0/16 is variably subnetted, 14 subnets, 5 masks
O       192.168.0.0/24 [110/301] via 172.16.253.70, 1d07h, Vlan470
         <--- Output suppressed --->

P#sh ip ospf database adv-router 1.1.1.1

OSPF Router with ID (10.1.1.1) (Process ID 60)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1386 0x800000BE 0x00762A 6

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum
172.16.253.62 1.1.1.1 1386 0x80000038 0x00F716

OSPF Router with ID (192.168.1.1) (Process ID 2)

OSPF Router with ID (172.253.1.40) (Process ID 1)

P#sh ip ospf database router adv-route 1.1.1.1

OSPF Router with ID (10.1.1.1) (Process ID 60)

Router Link States (Area 0)

LS age: 1460
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 1.1.1.1
Advertising Router: 1.1.1.1
LS Seq Number: 800000BE
Checksum: 0x762A
Length: 96
Number of Links: 6

    Link connected to: a Stub Network
     (Link ID) Network/subnet number: x.x.x.x
     (Link Data) Network Mask: 255.255.255.0
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

    Link connected to: a Stub Network
     (Link ID) Network/subnet number: x.x.x.x
     (Link Data) Network Mask: 255.255.254.0
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

    Link connected to: a Stub Network
     (Link ID) Network/subnet number: 192.168.0.0
     (Link Data) Network Mask: 255.255.255.0
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

    Link connected to: a Transit Network
     (Link ID) Designated Router address: 172.16.253.69
     (Link Data) Router Interface address: 172.16.253.70
      Number of TOS metrics: 0
       TOS 0 Metrics: 300

    Link connected to: a Transit Network
     (Link ID) Designated Router address: 172.16.253.62
     (Link Data) Router Interface address: 172.16.253.62
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

OSPF Router with ID (192.168.1.1) (Process ID 2)

OSPF Router with ID (172.253.1.40) (Process ID 1)

Rgds

Vaibhava Varma · ‎10-17-2011

Hi Muhammad

I am not able to find out any significant difference in the LSDB between two which would cause the issue.

Still I would like to see your full config of the 3 switches once for OSPF Parameters and the relevant Interface config. Is it possible for you to post the same. Did you try reloading the OSPF on R once and see if it resolves the issue.

Well if this is not a production network and a test environment can you issue "debug ip ospf spf" and "debug ip routing" on R during the reload.

Hope someone provides a better insight into this interesting issue to reach a resolution.

Regards

Varma