nanog mailing list archives
Re: reliably detecting the presence of a bridge?
From: Anoop Ghanwani <anoop () alumni duke edu>
Date: Wed, 16 Dec 2015 07:33:04 -0800
If LLDP (link layer discovery protocol) is enabled, you could try using that. There is a system capabilities TLV in the LLDPDU sent by a system, but I'm not sure how reliably it is filled in, especially if a device is capable of both switching and routing. The way LLDP is supposed to work is a device will receive LLDPDUs from other devices immediately adjacent to it. It can then read the LLDP database of those devices (via management) and figure out what those devices are connected to, and so on. Otherwise, bridges are supposed to be "transparent," so there is no way to know they are present by using user data frames. Anoop
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)
- Re: reliably detecting the presence of a bridge? Larry Sheldon (Dec 19)