nanog mailing list archives
Re: reliably detecting the presence of a bridge?
From: Dave Taht <dave.taht () gmail com>
Date: Wed, 16 Dec 2015 10:36:46 +0100
On Tue, Dec 15, 2015 at 4:19 PM, William Herrin <bill () herrin us> wrote:
On Tue, Dec 15, 2015 at 4:48 AM, Dave Taht <dave.taht () gmail com> wrote:I am curious if there is some sort of igmp or other form of message that would reliably detect if a switch had a bridge on it. How could deviceA detect deviceC was a bridge in this case?Hi Dave, Start with precision in language. An ethernet switch is one form of ethernet bridge although the reverse is not necessarily true. So, a switch is always a bridge by definition. Q.E.D.
Sure.
From what you've posted, you don't want to detect the difference between a switch and a bridge, you want to detect the difference
To be more clear I wanted to detect if there was more than one bridge on the network, where the bridge being a PITA was a wired/wireless bridge.
between a wired and wireless segment segment in the network. Is that correct? Any wireless link or just radio? Any radio link or just 802.11 wifi?
I believe the radios in this case were probably ubnt. https://nodes.wlan-si.net/network/statistics/
Are you just trying to detect stations behind wireless or do you want to identify segments that are carried over wireless?
The latter. In this case a routing optimization that works well on wired links was enabled when there were wireless bridges on that segment, leading to some chaos in the originally referenced thread. The "right", slower, inefficient on wired, routing metric is the ETX metric in that case, but knowing when to turn that on, automatically, would be nice... which means somehow detecting there was a wireless bridge on that network. So as no announcements of BPDUs are seen, I was hoping there was some sort of active query that could be made asking if there was anything weird and wireless nearby..... https://nodes.wlan-si.net/topology/
Regards, Bill Herrin -- William Herrin ................ herrin () dirtside com bill () herrin us Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
Current thread:
- reliably detecting the presence of a bridge? Dave Taht (Dec 15)
- Re: reliably detecting the presence of a bridge? Jared Mauch (Dec 15)
- Re: reliably detecting the presence of a bridge? Matthew Kaufman (Dec 15)
- Re: reliably detecting the presence of a bridge? William Herrin (Dec 15)
- Re: reliably detecting the presence of a bridge? Dave Taht (Dec 16)
- Re: reliably detecting the presence of a bridge? Masataka Ohta (Dec 16)
- Message not available
- Re: reliably detecting the presence of a bridge? Carsten Bormann (Dec 16)
- RE: reliably detecting the presence of a bridge? Chuck Church (Dec 16)
- Re: reliably detecting the presence of a bridge? Anoop Ghanwani (Dec 16)
- Re: reliably detecting the presence of a bridge? Dave Taht (Dec 19)
- Re: reliably detecting the presence of a bridge? Dave Taht (Dec 16)
- Re: reliably detecting the presence of a bridge? William Herrin (Dec 19)
- Re: reliably detecting the presence of a bridge? Larry Sheldon (Dec 19)
- Re: reliably detecting the presence of a bridge? John Levine (Dec 19)
- Re: reliably detecting the presence of a bridge? James R Cutler (Dec 19)
- Re: reliably detecting the presence of a bridge? Larry Sheldon (Dec 19)