I was wondering if somebody would please take a second and confirm for me
setting up frame relay sub-interfaces on a PM3.
Right now we connect multiple PM3s back to a single cisco via frame relay,
using serial sub-interfaces on the cisco with /30s for the addressing of
interfaces. The PM3s are configured with just a single ordinary frame
relay interface. We are using OSPF between ciscos and Portmasters.
In a couple of weeks, we will be bringing up another cisco in another
location, and ordering PVCs to partially mesh our frame relay setup, where
each portmaster can talk to either cisco directly, so if one cisco is
temporarily unreachable for whatever reason, data can still get to/from
the rest of the world via the other cisco. Each cisco will have its own
transit connection, that part we know how to handle, but never done
subinterfacing with Portmasters.
| |
[cisco]---[cisco]
\ \ / /
\ \ / /
\ X / < PVCs
\/ \/
PM3 PM3 (imagine other PM3s tied to both ciscos here too)
Looking at the 'Configurating Frame-Relay Sub-Interfaces (DLCI Bundling)
document under 'Troubleshooting',
6. Make sure the local IP address for the sub-interface is in
the same subnet or IP network as all other Frame-Relay interfaces
of the other routers. At the same time make sure that all the
netmasks match.
In the example that follows, they are using 192.168.1.1 for the WAN
interface on the Portmaster, and showing 192.168.1.2 and .3 for the remote
routers on their respective DLCIs.
Based on this, it looks like I will need to change from using /30s to /29s
for the interfaces between ciscos and portmasters so that all intefaces
will fall under the same network.
i.e.
(ip addrs changed to protect the innocent, I realize we can use rfc1918
space)
cisco #1
!
interface Serial1.1 point-to-point
description to portmaster #1
ip address 192.168.1.7 255.255.255.248
ip ospf network broadcast
frame-relay interface-dlci <whatever> broadcast
!
cisco #2
!
interface Serial0.1 point-to-point
description to portmaster #1
ip address 192.168.1.8 255.255.255.248
ip ospf network broadcast
frame-relay interface-dlci <whatever> broadcast
!
Portmaster #1
add location cwisnet
set cwisnet group 5
set W48 group 5
set cwisnet protocol frame
set location cwisnet address 192.168.1.9
set location cwisnet netmask 255.255.255.248
set location mtu 1500
set location cwisnet routing off
add dlci cwisnet <whatever to cisco 1> 192.168.1.7
add dlci cwisnet <whatever to cisco 2> 192.168.1.8
Specific questions-
Does this look right? Any obvious flaws? :)
If I recall correctly, Portmasters are classful, meaning I can't use the
first subnet, i.e. 192.168.0.0/29 for interfaces, right?
Multiple default routes, is possible to listen to a default route being
advertised by either cisco, or will I have to kludge it with two gateways
on the Portmaster with different metrics?
--- Bryan Wann bwann@cwis.net CWIS Internet Services http://www.cwis.net 918-967-2858Give a man a fish, he eats for a day; Teach a man to fish, he eats for a lifetime; Enlighten him further, and he opens a chain of seafood restaurants
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