redistribution question

If you have a route with a route-tag already set ,  and you redistribute this route  -- does it lose the  tag information?

Comments

  • JoeMJoeM ✭✭✭

    I think this is a "it depends" situation, and it depends on the routing protocol.  I believe generally yes, tags will/can propogate.

    Here is an interesting blog from Packet Life.  BGP Route Auto-Tagging

    1. demonstrates that BGP auto-tags with the most recent AS.

    2. when redistributed BGP-->OSPF ,  the last BGP tag stays intact.

  • If you have a route with a route-tag already set ,  and you redistribute this route  -- does it lose the  tag information?

    No, a route doesn't loose the tag in the case of OSPF & EIGRP. As far as I know, RIP can't take the tag that is coming from other domain, we should explicitly set the tag on the border router.

    HTH

  • JoeMJoeM ✭✭✭

    .... As far as I know, RIP can't take the tag that is coming from other domain, we should explicitly set the tag on the border router.

    I just tested this, and what Hari says is correct.   Redistribution into RIPv2  has the ability to tag prefixes, but it does not inherit a previous tag.  

    I tested from EIGRP-->OSPF-->RIP.

     

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