1. Home
  2. Cisco Systems
  3. OSPF - What am I missing

OSPF - What am I missing

Hi I am not too sure what I am missing here Currently my network is running RIP and I am seeing a lot of routes advertised via RIP but I would like to implement OSPF What I have from a network point of view is My router Ethernet 192.168.253.1 ---> Serial 10.200.3.17/30 ---> ISP

10.200.3.18/30 --->ISP (IP WAN) NETWORK ---> ISP 10.200.5.18/30 --->

My Router Serial 10.200.5.17/30 ---> Ethernet 192.168.200.1

This is just one of my links, I have others setup in a similar way to other sites using a /30 between myself and our ISP I am not seeing any routes advertised

Config on these 2 routers are RouterA router ospf 1 log-adjacency-changes network 10.0.0.0 0.255.255.255 area 1 network 192.168.253.0 0.0.0.255 area 1

RouterB router ospf 1 log-adjacency-changes network 10.0.0.0 0.255.255.255 area 1 network 192.168.201.0 0.0.0.255 area 1

sh ip ospf nei shows nothing

sh ip ospf Routing Process "ospf 1" with ID 192.168.253.1 Supports only single TOS(TOS0) routes Supports opaque LSA Supports Link-local Signaling (LLS) Supports area transit capability Initial SPF schedule delay 5000 msecs Minimum hold time between two consecutive SPFs 10000 msecs Maximum wait time between two consecutive SPFs 10000 msecs Incremental-SPF disabled Minimum LSA interval 5 secs Minimum LSA arrival 1000 msecs LSA group pacing timer 240 secs Interface flood pacing timer 33 msecs Retransmission pacing timer 66 msecs Number of external LSA 0. Checksum Sum 0x000000 Number of opaque AS LSA 0. Checksum Sum 0x000000 Number of DCbitless external and opaque AS LSA 0 Number of DoNotAge external and opaque AS LSA 0 Number of areas in this router is 1. 1 normal 0 stub 0 nssa Number of areas transit capable is 0 External flood list length 0 Area 1 Number of interfaces in this area is 2 Area has no authentication SPF algorithm last executed 00:24:39.040 ago SPF algorithm executed 4 times Area ranges are Number of LSA 1. Checksum Sum 0x00C824 Number of opaque link LSA 0. Checksum Sum 0x000000 Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 Flood list length 0

sh ip ospf data

OSPF Router with ID (192.168.253.1) (Process ID 1)

Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count

192.168.253.1 192.168.253.1 844 0x80000003 0x00C824 2

Can anyone suggest what I might be missing. Any further info required don't hesitate to contact me

Scott

Reply to
Scooty
Loading thread data ...

Did you speak to your ISP about making this change ?

If for example your ISP is using MPLS to transport your traffic accross their network, then they would need to reconfigure their routers to permit you to change from RIP to OSPF

Reply to
Merv

Thanks Merv, I believe the ISP uses MPLS in their core, so I will get onto them about this. Regards Scott

Reply to
Scooty

So your ISP is probably providing your with a service that is known as a Layer 3 VPN (L3VPN for short) which typically uses BGP and MPLS in the ISP core.

In L3VPN parlance your routers are CE routers (Customer Equipment) and the ISP router at the other end of the link is known as a PE router (Provider Equipment)

The routing protocol used between the CE and PE router terminates at the PE router. in other words your RIP updates, as such, do not flow across the ISP backbone. The RIP updates sent by your router are converted into BGP updates and carried across the ISP backbone. At the far end PE router, RIP updates are generated and sent to your CE router.

This is all quite invisible to your CE router which is simply configured with RIP and it would appear that it is exchanging RIP routes directly with your other CE routers. There is a LOT going on inside the ISP network to perfrom this "magic".

Take a look at slide 11 of Introduction to MPLS-based VPNs

formatting link

Reply to
Merv

Cabling-Design.com Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.