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Re: IGPs and services?

  • From: ww
  • Date: Thu May 18 13:40:44 2000

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>>>>> "jlewis" == jlewis  <[email protected]> writes:

    jlewis> On Tue, 16 May 2000, Roeland M.J. Meyer wrote:
    >> > [email protected]: 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 ( la DNS round-robin)
or cost a fortune ( la local-director). 

- -w
- --
Will Waites \________
[email protected]\____________________________
Idiosyntactix Ministry of Research and Development\

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