RE: mutual redistribute question

From: Justin Menga (Justin.Menga@xxxxxxxxxxxxxxxxxx)
Date: Tue Oct 17 2000 - 00:55:48 GMT-3

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   In fact by default in NBMA networks:
   
   Physical Interfaces: Split Horizon DISABLED
   Point-to-Point and Point-to-Multipoin Interfaces: Split Horizon
   ENABLED
   
   Of course this can be turned on/off with [no] ip split-horizon [eigrp
   x] under the appropriate interface.
   
   For a good discussion on route redistribution and distances see Jeff
   Doyle's Routing TCP/IP
   
   Regards,
   
   Justin Menga MCSE+I CCNP CCSE ASE
   WAN Specialist
   Computerland New Zealand
   PO Box 3631, Auckland
   DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
   mailto: justin.menga@computerland.co.nz
   
   -----Original Message-----
   From: Steve McNutt [mailto:lpd@jacksonville.net]
   Sent: Tuesday, 17 October 2000 1:52 p.m.
   To: Justin Menga; 'zhangxianqi'
   Cc: ccielab@groupstudy.com
   Subject: RE: mutual redistribute question
   
   DV protocols have the same problem in a spoke and hub type enviroment,
   because you have to turn off split-horizon in order for the hub to
   propagate routes to the spokes. In fact if you define a multipoint
   subinterface, split horizion is turned off by default. route
   redistribution on a NBMA topology is tricky business. Administrative
   distances complicate the issue.
   
   -----Original Message-----
   From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
   Justin Menga
   Sent: Monday, October 16, 2000 6:47 PM
   To: 'zhangxianqi'
   Cc: ccielab@groupstudy.com
   Subject: RE: mutual redistribute question
   
   Hi,
   
   
   
   Generally, you need to be very careful with OSPF (and possibly IS-IS)
   as the link state protocol does not employ split horizon. This means
   an external OSPF route that has been redistributed into OSPF will be
   redistributed back out.
   
   
   
   For Distance Vector, split horizon normally prevents this. The only
   issue occurs when you have multiple points of mutual redistribution
   where you should use filtering.
   
   
   
     Regards,
     
     Justin Menga MCSE+I CCNP CCSE ASE
     WAN Specialist
     Computerland New Zealand
     PO Box 3631, Auckland
     DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
     mailto: justin.menga@computerland.co.nz
     
   -----Original Message-----
   From: zhangxianqi [mailto:zhangxqi@gitc.com.cn]
   Sent: Monday, 16 October 2000 1:55 a.m.
   To: ccielab@groupstudy.com
   Subject: mutual redistribute question
   
   Hi all
   
   I have one question,what protocol need filte the route when do mutual
   redistribut at two point for avoid route loop?
   
   
   
   thanks

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