| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 751.1 | | MARVIN::TURNER | Neil Turner IPEG REO, 830-4140 | Thu Feb 13 1997 07:48 | 24 |
| I assume from your descriptions that each branch site has a single PVC
to its regional site. In addition to it's PVC to the branch a regional
site then has a single PVC back to the central site. I also assume that
there is no requirement of communication between branches or between
regional sites. All traffic is to be from branch to region and region to
central site?
If the above is true then you should configure the central to regional
sites into one IP subnet and each regional site to its branches in a
second IP subnet. However in order that the RIP information from the
branch sites is propagated to the central site the Frame Relay interface
on the regional site routers should be configured to have BOTH subnet
addresses (ie that of the branches and that of the central site).
If any inter-branch or inter-regional communication is required then
you will have to add static routes for these paths.
Incidentally have you considered using PPP over frame relay of this
configuration? PPP over frame relay treats each PVC as a separate
point-to-point link and may provide a better solution particularly if
inter-branch or inter-region traffic is required. It also allows you to
use data compression over the PVCs (depending on speed).
Neil
|
| 751.2 | FR meshed network and PPP over FR? | SNOFS1::63496::CHIUANDREW | | Wed Feb 19 1997 22:59 | 12 |
| re .1
It seems to me that if it is a MESHED network then we can 'group' ALL
the FR interfaces into one IP subnet. If it is a POINT-TO-POINT and
there will be inter-branches and inter-region communications, then we
have to set up PPP over fram relay where each sub-interface (within
the same FR physical line) will be one DIFFERENT IP subnets, is it
correct?
thanks in advance for help!
Andrew Chiu - NSIS Sydney
|
| 751.3 | Meshed or Fully meshed... | MARVIN::TURNER | Neil Turner IPEG REO, 830-4140 | Thu Feb 20 1997 05:53 | 7 |
| Yes if the configuration is FULLY meshed (every site has a PVC between itself and
every other remote site) then it would be possible to use just one IP subnet for
all of the FR interfaces on the routers. But I think this is unlikely in a
configuration this large (it would be very costly). If it is not FULLY meshed
then you need to follow my suggestions in .-2 and use 2 different subnets.
Neil
|
| 751.4 | | MARVIN::CLEVELAND | | Thu Feb 20 1997 08:32 | 3 |
| If you do use PPP over FR to arrange things on a point-point basis, you
don't need to assign a subnet to each PPP circuit--just use unnumbered
links.
|
| 751.5 | OSPF w/ P-to-MP interfaces | MARVIN::HART | Tony Hart, InterNetworking Prod. Eng. Group | Fri Feb 21 1997 06:03 | 8 |
| An alternative is to run OSPF rather than RIP and use point-to-multipoint
interfaces. Unlike NBMA mode, P-to-MP doesn't require the FR network to be
fully meshed, and you can use whatever addresses you like on the FR interfaces.
Thats just a FYI, the previous notes have suggested other good reasons why you
might want to run PPP anyway (compression for instance).
Tony
|
| 751.6 | How to do this? | SNOFS1::KHOOJEANNIE | Hangovers: The Wrath of Grapes? | Tue Feb 25 1997 23:07 | 12 |
| Our customer has 4 regional offices which are linked to their head office
with a PVC each. All the WAN frame relay interfaces are in the same IP
subnet.
What are the various options to enable one regional office to
communicate with another regional office? In Cisco routers, I believe
it is something to do with turning off split horizon - how does it work
with the RouteAbout?
Regards
Jeannie
|