Manual

Layer 2 Tunnel Protocol Version 3
How to Configure Layer 2 Tunnel Protocol Version 3
37
Cisco IOS Releases 12.0(29)S and 12.2(25)S
Configuring the Xconnect Attachment Circuit
This configuration procedure binds an Ethernet, 802.1q VLAN, or Frame Relay attachment circuit to an
L2TPv3 pseudowire for Xconnect service. The virtual circuit identifier that you configure creates the
binding between a pseudowire configured on a PE router and an attachment circuit in a CE device. The
virtual circuit identifier configured on the PE router at one end of the L2TPv3 control channel must also
be configured on the peer PE router at the other end.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface type slot/port
4. xconnect peer-ip-address vcid pseudowire-parameters [sequencing {transmit | receive | both}]
Step 8
ip tos {value value | reflect}
Example:
Router(config-pw)# ip tos reflect
(Optional) Configures the value of the ToS byte in IP
headers of tunneled packets, or reflects the ToS byte value
from the inner IP header.
• Valid values for the value argument range from 0 to
255. The default ToS byte value is 0.
Step 9
ip dfbit set
Example:
Router(config-pw)# ip dfbit set
(Optional) Configures the value of the DF bit in the outer
headers of tunneled packets.
• Use this command if (for performance reasons) you do
not want reassembly of tunneled packets to be
performed on the peer PE router. This command is
disabled by default.
Step 10
ip ttl value
Example:
Router(config-pw)# ip ttl 100
(Optional) Configures the value of the time to live (TTL)
byte in the IP headers of tunneled packets.
• Valid values for the value argument range from 1 to
255. The default TTL byte value is 255.
Step 11
ip protocol {l2tp | uti | protocol-number}
Example:
Router(config-pw)# ip protocol uti
(Optional) Configures the IP protocol to be used for
tunneling packets.
• For backward compatibility with UTI, enter uti or 120,
the UTI protocol number. The default IP protocol value
is l2tp or 115, the L2TP protocol number.
Step 12
sequencing {transmit | receive | both}
Example:
Router(config-pw)# sequencing both
(Optional) Specifies the direction in which sequencing of
data packets in a pseudowire is enabled:
• transmit—Updates the Sequence Number field in the
headers of data packets sent over the pseudowire
according to the data encapsulation method that is used.
• receive—Keeps the Sequence Number field in the
headers of data packets received over the pseudowire.
Out-of-order packets are dropped.
• both—Enables both the transmit and receive options.
Command or Action Purpose