165
Step Command
Remarks
2.
Create an MPLS L2VPN and
enter MPLS L2VPN view.
mpls l2vpn
vpn-name
[
encapsulation
{
atm-aal5
|
ethernet
|
fr
|
hdlc
|
ppp
|
vlan
}
[
control-word
|
no-control-word
] ]
You must create an L2VPN on the
PE for each VPN where a directly
connected CE resides. When
creating an L2VPN, you must
specify a VC type matching that of
the AC link.
3.
Configure an RD for the
MPLS L2VPN.
route-distinguisher
route-distinguisher
Once configured, an RD cannot
be changed, unless you delete
the L2VPN and then recreate it.
For more information about an
RD, see "Configuring MPLS
L3VPN."
4.
Configure one or more route
targets for the MPLS L2VPN.
vpn-target
vpn-target
&<1-16>
[
both
|
export-extcommunity
|
import-extcommunity
]
N/A
5.
Set the MTU for the MPLS
L2VPN.
mtu
mtu
Optional.
By default, the MTU of an MPLS
L2VPN is 1500 bytes.
The
mtu
command affects only
parameter negotiations, if any. It
does not affect data forwarding.
As a best practice, do not use this
command.
Creating a CE connection
Configuration parameters and guidelines
•
id
ce-id
: Specifies the CE ID of a local CE connected to the PE.
•
range
ce-range
: Specifies the CE range—the maximum number of CEs to which the specified
CE can connect.
You can configure a CE range greater than what is required based on your estimate of future
VPN expansion. This can reduce configuration workload required when CEs are added into the
VPN in future.
•
default-offset
default-offset
: Specifies the initial CE ID, 0 or 1. 0 indicates CEs in the VPN are
numbered from 0. 1 indicates CEs in the VPN are numbered from 1.
This parameter and the CE range together determine the label blocks that the PE assigns to
CEs:
{
When you first execute the
ce
command and specify the CE range as
ce-range1
, the PE assigns the first
label block. The LR of the label block equals
ce-range1
. If the
default-offset
is 0, the LO of the label block is 0.
Otherwise, the LO is 1.
{
When you execute the
ce
command for the second time and specify the CE range as
ce-range2
(greater
than
ce-range1
), the PE assigns the second label block. The LR of the second label block =
ce-range2
–
ce-range1
. If the
default-offset
is 0, the LO of the label block is
ce-range1
. Otherwise, the LO is
ce-range1
+1.
The subsequent label blocks are calculated in the same way. For example, if you execute the
following commands on the PE in order, the PE assigns three label blocks. They are LB1/0/10,
LB2/10/12, and LB3/22/14, where LB1, LB2, and LB3 are label values automatically selected
by the PE.
ce ce1 id 1 range 10 default-offset 0
ce ce1 id 1 range 22
ce ce1 id 1 range 36