H3C Technologies H3C S6800 Series Switches - Manual (Page 17)

10
Step Command Remarks
7. Allow the local AS number
to appear in the AS_PATH
attribute of routes received
from the peer, and set the
maximum number of
repetitions.
peer { group-name | ip-address }
allow-as-loop [ number ]
By default, BGP discards
incoming route updates that
contain the local AS number.
BGP detects routing loops by
examining AS numbers. The
routing information the MCE
advertises to a site carries the
local AS number. Therefore, the
route updates that the MCE
receives from the site also
include the local AS number.
This causes the MCE to be
unable to receive the route
updates. In this case, you must
configure this command to
allow routing loops.
8. Redistribute remote site
routes advertised by the PE
into BGP.
import-route protocol [ { process-id
| all-processes } [ allow-direct |
med med-value | route-policy
route-policy-name ] * ]
By default, no routes are
redistributed into BGP.
9. (Optional.) Configure
filtering of advertised
routes.
filter-policy { acl-number |
prefix-list prefix-list-name } export
[ protocol process-id ]
By default, BGP does not filter
advertised routes.
10. (Optional.) Configure
filtering of received routes. filter-policy { acl-number |
prefix-list prefix-list-name } import By default, BGP does not filter
received routes.
2. Configure a VPN site:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view. bgp as-number N/A
3. Configure the MCE as an
EBGP peer. peer { group-name | ip-address }
as-number as-number
N/A
4. Enter BGP-VPN IPv4 unicast
address family view.
address-family ipv4 [ unicast ] N/A
5. Enable BGP to exchange
IPv4 unicast routes with the
peer.
peer { group-name | ip-address }
enable
By default, BGP does not
exchange IPv4 unicast routes
with any peer.
6. Redistribute the IGP routes
of the VPN into BGP.
import-route protocol
[ { process-id | all-processes }
[ allow-direct | med med-value |
route-policy route-policy-name ]
* ]
By default, no routes are
redistributed into BGP.
A VPN site must advertise the
VPN network addresses it can
reach to the connected MCE.
Configuring IBGP between MCE and VPN site
To run IBGP between an MCE and a VPN site, you must configure a BGP peer for each VPN instance on
the MCE, and redistribute the IGP routes of each VPN instance on the VPN site.