Note from IPExpect (Redistribution)

Note about Problem in Redistribution

• When redistribution OSPF in to BGP, by default, BGP only accepts internal routes not external type 1 or type 3
• Beware of the metric used by RIP
• Watch for the administrative distance prolems especially since IGRP has a lower distance than OSPF
• Redistributing in to RIP require a metric or default-metric or it may get set to 16
• Always filter routes when doing redistribution

When Redistributing from on protocol to another 

• Each protocol has its own rules
• The path redistributed must be RIB best path
• The path redistributed must be in the routing table
• Connected routes always win.
• Results may or may not be expected

Metric

• You must set metric in RIP
• You must set metric in EIGRP except for Connected, Static to interface
• OSPF metric is 20 (for BGP is 1 )
• BGP has no metric, but origin is incomplete.

Redistribution Oddities

• Route map configuration allows.
• match ip address 
• match ip next-hop
• match interface ( of IP next hop)
• and others
• Conditional redistribution can occur.
• Redistribute from RIP to OSPF only if the next hop is 'x' (where /x/ may be the less-preffered RIP path)