179
Step
Command
Remarks
6.
Enable the IS-IS process on
the interface.
isis enable
[
process-id
]
By default, no IS-IS process is
enabled on the interface.
Configuring EBGP between a PE and a CE
1.
Configure the PE:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable BGP and enter BGP
view.
bgp as-number
N/A
3.
Enter BGP-VPN instance
view.
ip
vpn-instance
vpn-instance-name
Configuration commands in
BGP-VPN instance view are the
same as those in BGP view. For
details, see
Layer 3—IP Routing
Configuration Guide.
4.
Configure the CE as the VPN
EBGP peer.
peer
{
group-name
|
ip-address
[
mask-length
] }
as-number
as-number
By default, no BGP peer is
configured.
For more information about BGP
peers and peer groups, see
Layer
3—IP Routing Configuration
Guide.
5.
Create the BGP-VPN IPv4
unicast family and enter its
view.
address-family ipv4
[
unicast
]
By default, the BGP-VPN IPv4
unicast family is not created.
6.
Enable IPv4 unicast route
exchange with the specified
peer or peer group.
peer
{
group-name
|
ip-address
[
mask-length
] }
enable
By default, BGP does not
exchange IPv4 unicast routes with
any peer.
7.
Redistribute the routes of the
local CE.
import-route
protocol
[ {
process-id
|
all-processes
}
[
med med-value
|
route-policy
route-policy-name
] * ]
A PE must redistribute the routes
of the local CE into its VPN routing
table so it can advertise them to
the peer PE.
8.
(Optional.) Allow the local AS
number to appear in the
AS_PATH attribute of a
received route, and set the
maximum number of
repetitions.
peer
{
group-name
|
ip-address
[
mask-length
] }
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. In a
hub-spoke network where EBGP
is running between a PE and a
CE, the routing information the PE
advertises to a CE carries the AS
number of the PE. Therefore, the
route updates that the PE
receives from the CE also include
the AS number of the PE. This
causes the PE to be unable to
receive the route updates. In this
case, you must configure this
command to allow routing loops.
2.
Configure the CE:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
Содержание FlexNetwork 5510 HI Series
Страница 9: ...vii Remote support 460 Documentation feedback 460 Index 462 ...
Страница 318: ...309 Request list 0 Retransmit list 0 ...
Страница 363: ...354 Verify that CE 1 and CE 2 can ping each other Details not shown ...
Страница 446: ...437 The MCE has redistributed the OSPF routes of the two VPN instances into the EBGP routing tables of PE 1 ...
