Re: IGPs and services?

[ww () shadowfax styx org]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: RIPEMD160

> > > > > "jlewis" == jlewis  <jlewis () lewis org> writes:

    jlewis> On Tue, 16 May 2000, Roeland M.J. Meyer wrote:
    >> > ww () shadowfax styx org: Tuesday, May 16, 2000 10:34 PM
    >> 
    >> > What is  the general feeling about  running routing protocols
    >> on > web/dns/mail servers?

    [...]

    jlewis>  Running a  routing protocol  on a  unix box  doesn't mean
    jlewis> you're using  it as a router.  Perhaps  he just wants OSPF
    jlewis>  on a  few servers  so they  can send  their  packets more
    jlewis> efficiently.  Consider a case  where you have a few access
    jlewis> servers and  unix servers on the same  switch and a router
    jlewis> connecting  that POP to  your backbone.  Having  a routing
    jlewis> protocol on  those unix boxes means they  can send packets
    jlewis> directly to the  appropriate access server (or the router)
    jlewis> rather than everything to the router, just to have it spit
    jlewis> the packets  back out headed for an  access server on that
    jlewis> segment.

Correct. It also  means that they can inject  some routing information
- -- i.e. that  the ip address configured onto  their loopback interface
is  reachable  through the  ip  address  on  their ethernet  interface
subject  to a  certain cost.  The intent  is to  provide  an efficient
failover mechanism  (one host crashes, a backup  host is automatically
used since they both have the same address on their loopbacks, but the
backup is advertising  it with a higher cost), as  well as the ability
to easily relocate services to  different machines and load balance in
a way that doesn't break if  one host goes away (à la DNS round-robin)
or cost a fortune (à la local-director). 

- -w
- --
Will Waites \________
ww () shadowfax styx org\____________________________
Idiosyntactix Ministry of Research and Development\

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.1 (OpenBSD)
Comment: Processed by Mailcrypt 3.5.5 and Gnu Privacy Guard <http://www.gnupg.org/>

iQEXAwUBOSQl5g4cK24IcAwYFAOpywP/SjUKo09WCeBW0Wjq+6znsYJ6Eh7+Tirh
Ik7To9fFie00kmpc4VSYitKFpQEBNX7qN9y0vtdq0B5hzzUbUeDqip+xM3gdPO5G
VV2wSdob84S59eruRl6zqU7+WrcCqW5kq5OG9e3U1sG/5b38jcJbFB8KgvXwthgO
I8aZhsEK6YkD/RRZNEtkLbwHvBdMXI4SpxVIY5rjWCIbmgriGHzenJ9NVOXufgqv
KeJ8617eFcgSOCZUMtopoT2Q+Iorzm1nVGLHNdI8F/vTutV0RDgSGKjhOqx9yK69
aoVLsuqzr8qVQolzNh3ZPOZh2a2YkvpgtMDVK5fsSxrqNc37/4C4aYBl
=6Zzr
-----END PGP SIGNATURE-----