From: Lupi, Guy (Guy.Lupi@xxxxxxxxxxxxx)
Date: Wed Apr 24 2002 - 11:40:53 GMT-3
That is true, if the next hop is reachable via an igp you should get the
routes installed. If the routes get installed, but you cannot ping the ebgp
neighbor, is it possible that now the ebgp neighbor does not know how to get
back to the router that is pinging it? Does it have a route for the subnet
that is sourcing the pings?
~-----Original Message-----
~From: Babacar Diop [mailto:babacard2000@yahoo.com]
~Sent: Wednesday, April 24, 2002 10:35 AM
~To: Lupi, Guy
~Cc: ccielab@groupstudy.com
~Subject: RE: neighbor next-hop-self
~
~
~Thanks Lupy, i am understanding this better.
~Based on what you said, if i were to advertise the
~network connected to the ebgp neighbor in my igp then
~the routers should get the routes.
~
~After doing that, i still cannot ping the ebgp
~neighbor from any ibgp neigh
~
~Thanks
~
~
~--- "Lupi, Guy" <Guy.Lupi@eurekaggn.com> wrote:
~> If your routes are being passed to an IBGP neighbor
~> from an EBGP neighbor,
~> the next hop attribute remains the IP address that
~> the EBGP neighbor is
~> configured to send. If your IBGP neighbor does not
~> know how to get to this
~> address, the routes will never get installed. When
~> you do the next-hop-self
~> command, the router sends the update with itself as
~> the next hop to the
~> neighbor for which it is configured, so you are
~> probably seeing a case where
~> your internal router does not know how to get to the
~> next hop of the EBGP
~> routes, but when you give the next hop self command
~> on the upstream router
~> it can now get to the next hop and so installs the
~> routes.
~>
~> ~-----Original Message-----
~> ~From: Babacar Diop [mailto:babacard2000@yahoo.com]
~> ~Sent: Wednesday, April 24, 2002 9:41 AM
~> ~To: cciegroup
~> ~Subject: neighbor next-hop-self
~> ~
~> ~
~> ~Group,
~> ~
~> ~I am trying to understand the "neighbor
~> next-hop-self"
~> ~command. I know that it changes the next hop
~> addrress
~> ~on routing updates but how does it help me get
~> routes
~> ~(it is getting me routes that i would not get
~> unless i
~> ~put this command in).
~> ~
~> ~Thanks
~> ~
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