[c-nsp] Network design questions

[Raymond Macharia]

Hello Ogaki,

to make things easier and to get help it would be helpful to summarize what
you want to achieve if possible in simple point form
.If I try to summarize, are you trying to achieve some kind of link
redundancy and fail over mechanism so that if one link goes down the other
pciks up?

Regards

Raymond


On Dec 5, 2007 4:48 AM, Ogaki, Hidenori <hidenori.ogaki at kddibt.com> wrote:

> Hi experts,
>
> Since I am new with BGP/OSPF on Cisco product, your kind comment would
> be highly appreciated.
>
> Assuming a enterprise customer connecting to two IP-VPN with Carrier
> A(Primary) and B(Backup).
> CE-A and B is peering with each carrier(A/B)'s PE, where
> C(Customer)-Router is using OSPF.
>
> There are original and new plan. Though very long mail but only two
> questions please below on new plan?
>
>
>
>                                                  ## Site-1 ## ***
> Site-B is also using the same diagram not shown here though.
>                                                       |
>                                                +------C1------+
>  redistribute bgp AAA metric 20 metric-type 1 < |              | >
> redistribute bgp AAA metric 25 metric-type 1
>                                              CE-A/1         CE-B/1
> redistribute ospf X match internal external 2 < |              | >
> redistribute ospf X match internal external 2
>                                                |              | >
> AS-path prepend (+3)
>                       ## Site-2 ## CE-A/2---Carrier A     Carrier B
>                                                                 IP-VPN
> IP-VPN
>                                                |              |
>                                                |              |
>                                              CE-A/H        CE-B/H
>                        AS-path prepend (+1)  < |              | >
> AS-path prepend (+2)
>                                                +------CH------+
>                                                        |
>                                                 ## Site-Hub ##
> ## Original plan
>
> - Carrier A is used as completely as primary, where Carrier B as
> backup(normally no traffic going through)
> - Site-1 and B(not shown though) is dual homing to both Carrier A and B.
> - Site-2 is single homing to Carrier A.
> - Site-Hub is dual homing to both Carrier A and B as Hub site, to secure
> the traffic in case..
>     1. CE-A/1 fails for the traffic between Site-1 and Site-2 via
> Site-Hub through Carrier B.
>     2. Carrier A whole down for the traffic between Site-1 and
> Site-Hub.
>
>
>
>
>                                                  ## Site-B ##
>                                                       |
>                                                +------CB------+
>  redistribute bgp AAA metric 25 metric-type 1 < |              | >
> redistribute bgp AAA metric 20 metric-type 1
>                                              CE-A/B         CE-B/B
> redistribute ospf X match internal external 2 < |              | >
> redistribute ospf X match internal external 2
>                         AS-path prepend (+3) < |              |
>                       ## Site-2 ## CE-A/2---Carrier A     Carrier B
>                                                               IP-VPN
> IP-VPN
>                                                |              |
>                                                |              |
>                                              CE-A/H        CE-B/H
>                        AS-path prepend (+1)  < |              | >
> AS-path prepend (+2)
>                                                +------CH------+
>                                                        |
>                                                 ## Site-Hub ##
>
>
> ## New plan
>
> - Only the configuration change on Site-B since it decides to use
> Carrier-B as Primary where Site-1 keep using Carrier-A as primary.
> - Site-1 and B is dual homing to each Carrier A or B.
> - Site-2 and 3 is single homing to Carrier A.
> - Traffic between Site-B and Site-2 and 3 is via Site-Hub, it's accepted
> by this customer but for me...
> >>>>>>>>>>>>> Q1. Would someone let me now possible easiest way to route
> the traffic from/to Site-2/3 is via Carrier A? where Site-B to Site Hub
> is keep using Carrier B?
> - Site-Hub is dual homing to both Carrier A and B as Hub site, to secure
> the traffic in case..
>     1. CE-A/1 fails for the traffic between Site-1 and Site-2 via
> Site-Hub through Carrier B.
>     2. Carrier A whole down for the traffic between Site-1 and
> Site-Hub.
>     3. CE-B/B fails for the traffic between Site-1 and Site-2 via
> Site-Hub through Carrier A.
> >>>>>>>>>>>>> Q2. Any other better way to route the traffic from/to
> Site-B to/from Site-Hub only via Carrier B?
>
> Cheers,
> Hidenori
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-- 
Raymond Macharia