Specifications

96 CBI Buffer Formats HighWire MTP-2 - 1.2, September 4, 2002
6-3-40. CBI_M2_UNAVAILABLE An L2 sends this signal to the L3 to notify it that the join to the L2-L3 Data
Interface has permanently failed, and the L2 is unable to support the link.
When the L3 receives this message, it unjoins with the L2. This signal may be
sent instead of a CBI_M2_AVAILABLE signal (as the next signal after
responding to a CBI_M2_REGISTER request), if the L2 is unable to join to the
L2-L3 Data Interface.
There is no response to this message.
Data structure.
typedef struct cbi_m2_unavailable
{
CBI_IPS ips_hdr;
} CBI_M2_UNAVAILABLE;
Parameters.
ips_hdr
ips_hdrips_hdr
ips_hdr
IPS Header. For definition, see Section 6-1-1. The following fields are specified
below:
ips_type
ips_typeips_type
ips_type - IPS_CBI_M2_REM_UNAVAILABLE.
sender_handle
sender_handlesender_handle
sender_handle - L2’s handle for the join for this link.
receiver_handle
receiver_handlereceiver_handle
receiver_handle - L3’s handle for the join for this link.
6-3-41. CBI_M2_UPDATE_PARMS The L3 sends this signal to L2 to define dynamically changeable parameters
in L2. It can be sent at any time after L2 has been created. L2 returns the
signal as a response.
To configure the L2, an L3 must send at least one CBI_M2_UPDATE_PARMS
signal after registering with the L2, before it sends a CBI_M2_START. If
CBI_M2_UPDATE_PARMS is never issued, then the parameters take their
default values.
Note that if parameters controlling link proving are changed when the link is
active, this may cause the link to be failed erroneously or allow a link of
unacceptable quality to remain in service.
If a CBI_M2_UPDATE_PARMS is outstanding in the L2 when the L3 fails over,
the request should be processed to completion, but the response should be
discarded.
Further, a backup L3 must not make a new CBI_M2_UPDATE_PARMS request
until it has issued and received a response to a CBI_M2_QUERY_STATUS. In
turn, the L2 should delay the response to the CBI_M2_QUERY_STATUS until it
can accept a new CBI_M2_UPDATE_PARMS request.