425
Step
Command
Remarks
routes from the PE.
4.
(Optional.) Configure the
OSPF domain ID.
domain-id
domain-id
[
secondary
]
The default domain ID is 0.
5.
(Optional.) Configure the
type codes of OSPF
extended community
attributes.
ext-community-type
{
domain-id
type-code1
|
router-id type-code2
|
route-type
type-code3
}
The defaults are as follows:
•
0x0005 for Domain ID.
•
0x0107 for Router ID.
•
0x0306 for Route Type.
6.
(Optional.) Configure the
external
route tag
for
imported VPN routes.
route-tag tag-value
By default, no route tag is
configured.
In some networks, a VPN might
be connected to multiple MCEs.
When one MCE advertises the
routes learned from BGP to the
VPN, the other MCEs might learn
the routes, resulting in routing
loops. To avoid such routing
loops, you can configure route
tags for VPN instances on an
MCE.
As a best practice,
configure the same route tag for
the same VPN on the MCEs.
7.
Redistribute the VPN routes.
import-route
protocol
[
process-id
|
all-processes
|
allow-ibgp
] [
allow-direct
|
cost
cost
|
nssa-only
|
route-policy
route-policy-name
|
tag tag
|
type
type
] *
By default, no
routes
are
redistributed into OSPF.
8.
(Optional.) Configure OSPF
to redistribute the default
route.
default-route-advertise
summary cost
cost
By default, OSPF does not
redistribute the default route.
This command redistributes the
default route in a Type-3 LSA. The
MCE advertises the default route
to the PE.
9.
(Optional.) Configure filtering
of advertised routes.
filter-policy
{
acl-number
|
prefix-list
prefix-list-name
}
export
[
protocol
[
process-id
] ]
By default, redistributed routes
are not filtered.
10.
(Optional.) Configure the
default parameters for
redistributed routes (cost,
route number, tag, and type).
default
{
cost
cost
|
tag
tag
|
type
type
} *
The default cost is 1, the default
tag is 1, and default type of
redistributed routes is Type-2.
11.
Create an OSPF area and
enter OSPF area view.
area
area-id
By default, no OSPF area is
created.
12.
Enable OSPF on the
interface attached to the
specified network in the area.
network
ip-address
wildcard-mask
By default, an interface neither
belongs to any area nor runs
OSPF.
Configuring IS-IS between an MCE and a PE
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Create an IS-IS
process for a VPN
instance and enter
isis
[
process-id
]
vpn-instance
vpn-instance-name
N/A
