Re: RIP classful or not

From: Danny Andaluz (dannyandaluz@comcast.net)
Date: Tue Sep 02 2003 - 03:36:05 GMT-3


Thanks for the replies. This answers my questions exactly. Phew!!

Danny
  ----- Original Message -----
  From: Brian Dennis
  To: Danny.Andaluz@triaton-na.com ; ccielab@groupstudy.com
  Sent: Tuesday, September 02, 2003 1:35 AM
  Subject: RE: RIP classful or not

  Short answer:
  RIPv1 supports host routes.

  Long answer:
  RFC 1058
  http://www.faqs.org/rfcs/rfc1058.html

  <Quote>
  The RIP protocol makes no formal distinction between networks and hosts.
  It simply describes exchange of information about destinations, which
  may be either networks or hosts.
  </Quote>

  Good luck on the lab ;-)

  Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
  bdennis@internetworkexpert.com
  Toll Free: 877-334-8987
  Direct: 775-745-6404 (Outside the US and Canada)
  Internetwork Expert, Inc.
  http://www.InternetworkExpert.com

  -----Original Message-----
  From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
  Danny.Andaluz@triaton-na.com
  Sent: Monday, September 01, 2003 10:23 PM
  To: ccielab@groupstudy.com
  Subject: RIP classful or not

  Hello, Group.

  I found something interesting (and troubling for me)with regards to RIP.
  My
  understanding of RIP v1 is that it will not pass routes that do not
  match
  the subnet mask of the outgoing interface. I thought this was true for
  both
  RIP routes and routes redustributed into RIP. I saw a scenario where a
  /32
  route was being sent out of a /24 interface and appearing in the routing
  table of the router on the other end. This /32 route was being
  redistributed into RIP from OSPF. My question is does the rule of
  routes
  having to match the mask on the outgoing interface not apply to routes
  redistributed into RIP?

  The scenario used a prefix-list to stop /32 routes from being
  Redistributed
  from OSPF into the RIP domain.

  ip prefix-list 1 seq 10 permit 172.31.0.0/16 le 31

  Without this line, the RIP domain would see these /32 routes.

  Is this normal?? I'm 2 days away, fellas. I gotta clear this up soon.

  Thanks,
  Danny

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