07-11-2016 12:00 PM
Hi,
I have MPLS rings Topology and no P as the scenario as follow
My Queries
1. C6500-VSS will be consider as Internet Gateway what is the configuration between the PE and this switch, can I consider these switch as CE?
Thanks for help in advanced
Solved! Go to Solution.
08-01-2016 10:52 PM
Hi Steven,
First of all check with your ISP if they are ready to support OSPF as PE-CE routing protocol. Because there is little complexity at provider end while using OSPF between PE-CE.
1. Router ID
Ans: Please do so as per your requirement. Otherwise router will choose an OSPF router ID its own.
2. auto-cost reference-bandwidth.
Ans: if you a link fatser then 100 Mb in your network and you want more granularity of metric. You can use this command.
3. max-metric router-lsa on-startup , timers throttle spf and timers lsa arrival
Ans: Since i applied the above parameters when i configured IGP between PEs.
4. Do I need Domain ID?
Ans: Domain tag is a loop prevention mechanism while using OSPF as PE-CE protocol.
Please refer below link.
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/118800-configure-ospf-00.html
If your network resembles to the scenario explained in above link, you can use Domain TAG/DN bit mechanism.
5. do you recommend to use area 0 between PE to CE or different area for each site?
Ans: I believe you can use are 0 on all sites.
You can go through below link as well.
https://networkinferno.net/ccie-study-ospf-sham-link
Please rate if it helped.
HTH
-Amit
07-17-2016 09:27 PM
Hi,
>Yes VSS should be considered as CE.
>You can consider eBGP for connectivity between CE and PE.
>You can use any IGP protocol on Head quarters for internal communication and do mutual redistribution of routes between IGP and eBGP.
>Originate a default route from Head quarters so that all internet traffic from remote CEs can go via Head Quarters only.
HTH
-Amit
07-26-2016 12:13 AM
Hi Amit,
Thanks for your reply, i will use OSPF between PE and CE each CE has different subsets and i have one VRF for all sites, and bellow the configuration
router ospf 300 vrf INTRANET
network x.x.x.x x.x.x.x area 0
redistribute bgp 65530 subnets
My question is do i need to configure these parameters under router ospf 300 vrf INTRANET :
1. Router ID.
2. auto-cost reference-bandwidth.
3. max-metric router-lsa on-startup , timers throttle spf and timers lsa arrival
since i applied the above parameters when i configured IGP between PEs.
4. Do I need Domain ID?
5. do you recommend to use area 0 between PE to CE or different area for each site?
thanks in advanced to help me for these quires?
08-01-2016 10:52 PM
Hi Steven,
First of all check with your ISP if they are ready to support OSPF as PE-CE routing protocol. Because there is little complexity at provider end while using OSPF between PE-CE.
1. Router ID
Ans: Please do so as per your requirement. Otherwise router will choose an OSPF router ID its own.
2. auto-cost reference-bandwidth.
Ans: if you a link fatser then 100 Mb in your network and you want more granularity of metric. You can use this command.
3. max-metric router-lsa on-startup , timers throttle spf and timers lsa arrival
Ans: Since i applied the above parameters when i configured IGP between PEs.
4. Do I need Domain ID?
Ans: Domain tag is a loop prevention mechanism while using OSPF as PE-CE protocol.
Please refer below link.
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/118800-configure-ospf-00.html
If your network resembles to the scenario explained in above link, you can use Domain TAG/DN bit mechanism.
5. do you recommend to use area 0 between PE to CE or different area for each site?
Ans: I believe you can use are 0 on all sites.
You can go through below link as well.
https://networkinferno.net/ccie-study-ospf-sham-link
Please rate if it helped.
HTH
-Amit
08-10-2016 11:06 PM
Thanks a lot for your help
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