Heads up: ladvd using ifAlias coming to rawhide

Tomasz Torcz tomek at pipebreaker.pl
Tue Jan 24 15:20:16 UTC 2012


  WHO MAY BE AFFECTED: people, who installed "ladvd" voluntarily. It is not
  installed by default.

  WHAT IS LADVD: it is a small daemon, using low-level ethernet mechanisms to
  learn how switches are connected. It implements CDP protocol, LLDP protocol
  and few others. By default it sends announcement only for protocols it already
  heard (this way it does not generate CDP traffic if you don't have Cisco switch).

  WHAT'VE CHANGED: there's a feature called ifAlias in Linux network stack, giving
  ability to append free-form description to interface. In ladvd-1.0.0, this field
  is filled with name and port number of upstream switch, where our server is
  connected. It looks like that in "ip" output:

2: p2p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    alias connected to PROCURVE J9450A (13)

  ifAlias is not widely used on Linux.  I only heard about Quagga doing something 
  with it.

  WHAT TO EXPECT: nothing should break because of ifAlias. But if something
  goes wrong, let me wrong, I will flip default switch to off in our unit file.


Tomasz Torcz                "Funeral in the morning, IDE hacking
xmpp: zdzichubg at chrome.pl    in the afternoon and evening." - Alan Cox

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