From: SAMARTH (samarth_04@hotmail.com)
Date: Sun Dec 16 2007 - 11:34:22 ART
The first link of the hub will import the routes and the second link will
export the routes using the route targets
The fist link will have the import route targets of the spokes and the
second link will have the export route target, this export route target is
imported by the spokes. This is done so that the traffic transits the hub
site.
Best Wishes,
C SAMARTH
CCIE #18535
CCSP CCNP CCNA
MCSE MCSD SCSA1
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Ken
Young
Sent: Sunday, December 16, 2007 2:12 PM
To: 'Cisco certification'
Subject: MPLS/VPN Hub-and-spoke Topology
MPLS/VPN Hub-and-spoke Topology
MPLS and VPN Architectures Page -242
-OR-
MPLS and VPN Architectures CCIP Edition Page -260
"In either case, it is necessary to define a hub site that contains full
routing knowledge of all spoke sites that belong to the same VPN. All
traffic from the spoke sites, destined either for the central site services
or for intersite connectivity, will flow through the central hub site. With
this type of topology, the spoke sites export their routes to the hub site,
and then the hub site re-exports the spoke site route through a second
interface (either physical or logical) using a different route target so
that other spoke sites can import the routes. This causes the hub site to
become a transit point for interspoke connectivity."
Can someone explain to my why this is done with a second connection?
Split-Horizon Rule maybe ??
Thanks,
Ken
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