Specifications

ttag-control-protocol vsi
MP-826
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Defaults VSI is disabled.
Command Modes Interface configuration (config-if)
Command History
Usage Guidelines
• The command is only available on interfaces that can serve as a VSI master control port. Cisco
recommends that all options to the tag-control-protocol vsi command be entered at the same time.
• After VSI is active on the control interface (through the earlier issuance of a tag-control-protocol
vsi command), reentering the command may cause all associated XTagATM interfaces to shut down
and restart. In particular, if you reenter the tag-control-protocol vsi command with any of the
following options, the VSI shuts down and reactivates on the control interface:
– id
– base-vc
nak [basic
| extended] (Optional) Allows the label switch controller (LSC) to request extended
negative acknowledgment (NAK) responses from the VSI slave. The
extended NAK response indicates a dangling connection on the VSI slave.
If the slave sends an extended NAK response code, the LSC sends a delete
connection command that enables the VSI slave to delete the dangling
connection.
Use the basic ke
yword to specify the NAK 11 and NAK 12 response codes
from the VSI. If you use the nak basic keywords, support for extended NAK
is not enabled on the LSC. The interface configuration does not indicate that
basic NAK support is enabled. The output of the show controller vsi
session command does not indicate that basic NAK support is enabled.
Use the ext
ended keyword to specify extended NAK codes 51 - 54 from the
VSI, which are supported in VSI protocol version 2.4. If you use the nak
extended keywords, support for extended NAK is enabled on the LSC. The
interface configuration indicates that extended NAK support is enabled.
The output of the show controller vsi session command also indicates that
extended NAK support is enabled.
Note Use the nak extended keyword only if all VSI slaves support
extended NAK codes.
retry t
imeout-count (Optional) Determines the value of the message retry timer (in seconds) and
the maximum number of retries. The default is 8 seconds and 10 retries.
slaves s
lave-count (Optional) Determines the number of slaves reachable through this master
control port. The default is 14 (suitable for the Cisco BPX switch).
Release Modification
12.0(5)T This command was introduced.
12.2(15)T The de
lay keyword was added.
12.3(2)T The na
k keyword was added.
12.4(20)T This command was removed.