Dedicated Point to Point T1 Connection via 2620 Routers
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Posted by on September 9, 2008, 5:15 pm
Please log in for more thread options I am trying to connect two remote sites using dedicated point to point T1. The router at each site is Cisco 2620. Currently, there is only one WIC card in each of the 2620 router. My question is about the network subnet between the two routers. Do I have to use some public subnet that my ISP will provide me or can I just use any private subnet (taken into account that this private subnet will be different from the subnets use for the remote LANs)? Do I need specific settings from my ISP? Anybody has a sample config for this setup? For future expansion, if we need to up the bandwidth from a T1 to 2 Bonded T1, is this something that can be done easily router- configuration wise? (with additional WIC in each of the 2620 router). Thanks. BV | |||||||||||||
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Posted by Hansang Bae on September 9, 2008, 8:35 pm
Please log in for more thread options bavien@gmail.com wrote: Can you be more specific? Do you have this setup? ISP ---RTR1 -----new T1 --- RTR2 or ISP1 ---RTR1 -----new T1 --- RTR2 ---ISP1 or ISP ---RTR1 -----new T1 --- RTR2 ---ISP2 -- hsb "Somehow I imagined this experience would be more rewarding" Calvin ******************************************************************** Due to the volume of email that I receive, I may not be able to reply to emails sent to my account. Please post a followup instead. ******************************************************************** | |||||||||||||
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Posted by on September 9, 2008, 10:27 pm
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> bav...@gmail.com wrote:
> > I am trying to connect two remote sites using dedicated point to point
> > T1. The router at each site is Cisco 2620. >
> > Currently, there is only one WIC card in each of the 2620 router. My
> > question is about the network subnet between the two routers. >
> > Do I have to use some public subnet that my ISP will provide me or can
> > I just use any private subnet (taken into account that this private > > subnet will be different from the subnets use for the remote LANs)? >
> > Do I need specific settings from my ISP?
>
> > Anybody has a sample config for this setup?
>
> > For future expansion, if we need to up the bandwidth from a T1 to 2
> > Bonded T1, is this something that can be done easily router- > > configuration wise? (with additional WIC in each of the 2620 router). >
> > Thanks.
>
> > BV
>
> Can you be more specific? =A0Do you have this setup? > > ISP ---RTR1 -----new T1 =A0--- RTR2 > > or > > ISP1 ---RTR1 -----new T1 =A0--- RTR2 ---ISP1 > > or > > ISP ---RTR1 -----new T1 =A0--- RTR2 ---ISP2 > > -- > > hsb > > "Somehow I imagined this experience would be more rewarding" Calvin > ******************************************************************** > Due to the volume of email that I receive, I may not be able to > reply to emails sent to my account. Please post a followup instead. > ******************************************************************** Hansang, A T1 line from the same ISP is brought into the demarc at each site so I guess it would the second scenario you described... ISP1---RT1---new T1--- RT2 --- ISP1 Hope this clear up my question... BV | |||||||||||||
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Posted by Hansang Bae on September 9, 2008, 11:09 pm
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bavien@gmail.com wrote: > A T1 line from the same ISP is brought into the demarc at each site so
> I guess it would the second scenario you described... > > ISP1---RT1---new T1--- RT2 --- ISP1 > > Hope this clear up my question... In that case, you don't need routable IP's on the transit (new) T1 connection. The religious debate about whether this is a good idea or not is proably a moot point in this day and age. Just make sure you account for the routing to and from RT1 subnets and RT2 subnets. You can run an IGP (RIP2 for example) or you can use static routes. Assuming you're getting a default route from your ISP, make sure you redistribute that into your IGP. This way, you get a redundant route out if the right side link to ISP1 goes down. RT2 folks will know to follow the default out via ISP1/RT1 path. -- hsb "Somehow I imagined this experience would be more rewarding" Calvin ******************************************************************** Due to the volume of email that I receive, I may not be able to reply to emails sent to my account. Please post a followup instead. ******************************************************************** | |||||||||||||
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Posted by on September 9, 2008, 11:50 pm
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> bav...@gmail.com wrote:
> > A T1 line from the same ISP is brought into the demarc at each site so
> > I guess it would the second scenario you described... >
> > ISP1---RT1---new T1--- RT2 --- ISP1
>
> > Hope this clear up my question...
>
> In that case, you don't need routable IP's on the transit (new) T1 > connection. =A0The religious debate about whether this is a good idea or > not is proably a moot point in this day and age. > > Just make sure you account for the routing to and from RT1 subnets and > RT2 subnets. =A0You can run an IGP (RIP2 for example) or you can use > static routes. > > Assuming you're getting a default route from your ISP, make sure you > redistribute that into your IGP. =A0This way, you get a redundant route > out if the right side link to ISP1 goes down. =A0RT2 folks will know to > follow the default out via ISP1/RT1 path. > > -- > > hsb > > "Somehow I imagined this experience would be more rewarding" Calvin > ******************************************************************** > Due to the volume of email that I receive, I may not be able to > reply to emails sent to my account. Please post a followup instead. > ******************************************************************** Hansang, I am not sure if this will change the equation, but there is an existing T1 at site2 to provide Internet access for LAN users at site2. The idea is to connect the network between the two sites using this new T1 (dedicated site to site connection) and also have the LAN users behind router1 use the same existing T1 at site2 to get outside/ Internet access. Thanks. BV | |||||||||||||
> T1. The router at each site is Cisco 2620.
>
> Currently, there is only one WIC card in each of the 2620 router. My
> question is about the network subnet between the two routers.
>
> Do I have to use some public subnet that my ISP will provide me or can
> I just use any private subnet (taken into account that this private
> subnet will be different from the subnets use for the remote LANs)?
>
> Do I need specific settings from my ISP?
>
> Anybody has a sample config for this setup?
>
> For future expansion, if we need to up the bandwidth from a T1 to 2
> Bonded T1, is this something that can be done easily router-
> configuration wise? (with additional WIC in each of the 2620 router).
>
> Thanks.
>
> BV