Lsr Overload Protection Capability; Figure 55: Lsr Overload Status Tlv (Type = 0X3E02) - Alcatel-Lucent 7450 Manual

LSR Overload Protection Capability

This feature introduces a new TLV referred to as LSR Overload Status TLV. This TLV is encoded
using vendor proprietary TLV encoding as per RFC 5036. It uses a TLV type value of 0x3E02 and
the Timetra OUI value of 0003FA.
where:
U-bit: Unknown TLV bit, as described in RFC 5036. The value MUST
be 1 which means if unknown to receiver then receiver should ignore
F-bit: Forward unknown TLV bit, as described in RFC RFC5036. The value
of this bit MUST be 1 since a LSR overload TLV is sent only between
two immediate LDP peers, which are not forwarded.
S-bit: The State Bit. It indicates whether the sender is setting the
LSR Overload Status ON or OFF. The State Bit value is used as
follows:
1 - The TLV is indicating LSR overload status as ON.
0 - The TLV is indicating LSR overload status as OFF.
When a LSR that implements the procedures defined in this document generates LSR overload
status, it MUST send LSR Overload Status TLV in a LDP Notification Message accompanied by a
FEC TLV. The FEC TLV must contain one Typed Wildcard FEC TLV that specifies the FEC type
to which the overload status notification applies.
The feature in this document re-uses the Typed Wilcard FEC Element which is defined in RFC
5918.
LSR Overload Protection Capability
To ensure backward compatibility with procedures in RFC 5036 an LSR supporting Overload
Protection need means to determine whether a peering LSR supports overload protection or not.
An LDP speaker that supports the LSR Overload Protection procedures as defined in this
document MUST inform its peers of the support by including a LSR Overload Protection
Capability Parameter in its initialization message. The Capability parameter follows the
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|U|F| Overload Status TLV Type
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Timetra OUI
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S|

Figure 55: LSR Overload Status TLV (Type = 0x3E02)

1 2
|
= 0003FA
Reserved
3
Length |
|
|
7450 ESS MPLS Guide