I have two options (probably more) for router config at a single tower location. I’m looking for experienced input on what you have found best.
There is a tower:
It has two backhaul feeds
Lets assume I have a RB532 with 9 ethernet ports everything plugs into
Backhaul feed radios are RB333’s with routed interfaces, not bridged.
Each backhaul has its own /29 subnet and the tower has /25 subnet
Question…
Each RB333 has a eth1 and wlan1 & Has ospf configured and working on both interfaces
The RB532 has /25 address and has ospf configured as well
Which device do I put the default gateway for the /25 on? I’m guessing if the RB532 is assigned as the gateway for tall the devices on the /25 and there is no default route statically added it will route vie Backhaul1 or backhaul 2 based on availability and path cost to our main internet router. This makes sense but I do not currently have it setup this way.
Is it better to have a single routerboard, say a 3 port RB333 with one interface to a switch on the tower, and the other two for two different backhaul feeds with bridged radios…
Or better to have the Backhaul radios routed and all 3 of them talking together voa ospf to figure out what goes where?
In either case if the RB333 set as the default gateway for the /25 on the tower craps out, I lose everything on the tower but the backhaul links remain operational to pass traffic flowing through this tower, thus only a local outage at this particular tower. If each backhaul radio is routed and there are only two of them (the backhaul radios/router) and they are plugged into a switch, then is I loose either the flow through the tower stops but the local tower remains online because I can manually add the gateway interface for the /25 to the remaining backhaul radios ethernet interface.
This is difficult to type as a question and keep brief, hopefuly someone understands what I am trying to ask and can provide input…
best would be to propagate the default route from your main router.
Second best is to add it to the both backhaul routers. The prefered
backhaul router has set a better metric. Both must propagate the
default route. Make ping checks for the routes. No other device on
the tower gets a default route set.
If there are devices without ospf on the tower set them a virtual default
gw and configure it with vrrp on the backhaul routers. In this scenario I
would disable ospf on all devices on the tower as vrrp does the job.