Depending on how you monitor your network setting the radios up so that you can access them both when the link is down may be a bad thing. I use the dude to monitor and if the link goes down you wouldn't get notification if the remote radio was still accessible. This is how I do it:
/24 subnet (private 10.0.0.0/24) .2 Router A .3 Radio A .4 Radio B .5 Router B If i need to get to radio B while the link is down i can disable the interface and OSPF network for that interface on Router A and then log into Router B and change the interface IP to .2. Then i can get to the remote radio. It takes a little bit more work but in my view is a whole lot easier to keep track of IPs. On Thu, Aug 11, 2016 at 5:30 PM, Dennis Burgess <dmburg...@linktechs.net> wrote: > /30s are the simplest, you can use /32 addressing on the link between the > two MTs. Or get a radio that is smart enough to handle two gateways with > checks J Out of band management radios are better yet /J > > > > [image: DennisBurgessSignature] > > www.linktechs.net – 314-735-0270 x103 – dmburg...@linktechs.net > > > > *From:* Af [mailto:af-boun...@afmug.com] *On Behalf Of *Cassidy B. Larson > *Sent:* Thursday, August 11, 2016 4:10 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] Access Both Sides of Downed Link Using OSPF? > > > > A lot of times we want to login to side “B” when the link between A and B > is down…but we can’t unless each side is advertised as a /30..but I want > the two radio’s to see each other when they’re up. > > > > So what I’ve done most recently is: > > .1 = Router A (configured as /30) > > .2 = Radio A (configured as /29, GW set to .1) > > .5 = Radio B (configured as /29 GW set to .6) > > .6 = Router B (configured as /30) > > > Then I just run OSPF on a separate /30 across that path on a separate > VLAN. The above is just for MGMT of the radios. > > > > > > > > On Aug 11, 2016, at 3:02 PM, Christopher Gray <cg...@graytechsoftware.com> > wrote: > > > > How do you setup radio addresses so both ends of a link can be accessed > (via loop) when the link is down? > > > > *What I've been doing... and how it doesn't work:* > > I've been setting up OSPF links using a /29. > > > > Router A -- Radio A ~~ Radio B -- Router B > > > > Devices get addresses: > > - .1 - Router A > - .2 - Router B > - .3 - Radio A (Gateway set to .1) > - .4 - Radio B (Gateway set to .2) > - .5 - Spare (used when swapping links) > - .6 - Spare (used when swapping links) > > This feels very clean, and works nicely when the link is up or when there > is no network loop. However, when the link goes down, if I am connected > near Router A, all traffic for that /29 is routed through Router A, and I > have no access to the B side. Then, I can only access the B side if I > connect closer to Router B. > > > > Suggestions? > > > > Thanks - Chris > > >
