LLXBK

Prolog  

Control Block Contents  
   LLXBK DSECT
   LLXITEM DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

LLXBK Prolog

 NAME       : HCPLLXBK
 DESCRIPTION: Link Layer Index Table entry
 DSECT      : LLXBK
 FUNCTION   :
              The LLXBK structure represents an array of sessions
              (NIDBK pointers) registered for a specific Link ID.
              The Link ID is the MAC address.
              The LLXBK structure is variable length.
 LOCATED BY -
   LANIDTBL - LAN Link ID Table (MLTBK)
 CREATED BY :
              Link Layer functions in module HCPLLN.
 DELETED BY :
              Link Layer functions in module HCPLLN.
 RELOCATION CONSIDERATIONS : None
 LLXID definition -
   LLXVLAN represents an IEEE VLAN group, or an
   internally defined code.  The following table
   describes the purpose of each LLXVLAN code:
     LLXVLAN | Frames which may be delivered
     --------|-------------------------------------------
     x'0000' | Untagged (or NULL tagged) frames
     x'0xxx' | VLAN tagged frames
     x'0FFF' | Not a valid VLAN group
     x'1000' | ANY frames (the target is VLAN ANY)
     x'1xxx' | Routers (for unclaimed frames)
   LLXMAC represents a MAC address identifying a
   device (or group of devices) as the destination
   of a network frame.

LLXBK Control Block Content

LLXBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      LLXBK          Link Layer Index Table entry
      Link ID (Key) for LAN ID Table is VLAN||MAC.
0000    0 Bitstring    8 LLXID (0)      Link ID
0000    0 Bitstring    6 LLXMAC         MAC Address for this entry
0006    6 Bitstring    2 *              VLAN ID for this entry
      Counters.
0008    8 Signed       2 LLXMAX         Maximum for this list
000A   10 Signed       2 LLXCOUNT       Number of entries
          00000001       LLX_INIT       1 Initial allocation
          00000008       LLX_INCR       8 Incremental allocation
          000003E8       LLX_MAX        1000 Maximum allocation
          0000000C       LLXHDRLN       *-LLXBK Length of header
      Array of device pointers begins here (see LLXITEM).
          0000000C       LLXLIST        * Start of device list
000C   12 Address      4 LLXPTR1        Pointer to first device
      Overlay LLXID for the LAN Router Table.
        Key = VLAN||ipver||routertype.
0000    0 Bitstring    4 LLXRXID (0)    Router ID (VLAN||ipver||type)
0000    0 Signed       2 LLXRXVID       VLAN ID for this entry
0002    2 Bitstring    1 LLXRXVER       IP Version (4=IPv4, 6=IPv6)
0003    3 Bitstring    1 LLXRXTYP       Router Type (Pri, Sec, MC)
0004    4 Bitstring    4 *              Unused for LLXRXID
0008    8 Bitstring    4 *              LLXMAX, LLXCOUNT
      OBJECT - LLXITEM
        One LLXITEM exists for each entry in LLXLIST.

LLXITEM DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      LLXITEM        Link Layer Index Table entry
0000    0 Address      4 LLXPTR         Pointer to device(1) entry
          00000004       LLXPTRLN       *-LLXITEM Length of one list
                                        entry
          00000002       LLX_EXP        2 Bits to shift to multiply
                                        length
          00000004       LLXNEXT        * Offset to next entry

LLXBK Storage Layout

          
*** LLXBK - Link Layer Index Table entry
*
*     +-----------------------------------------+-------------+
*   0 |                 LLXMAC                  |/////////////|
*     +-------------+-------------+-------------+-------------+
*   8 |   LLXMAX    |  LLXCOUNT   |         LLXPTR1           |
*     +-------------+-------------+---------------------------+
*  10
*
*** LLXBK - Link Layer Index Table entry
          
*** Overlay for LLXID in LLXBK
*
*     +-------------+------+------+---------------------------+
*   0 |  LLXRXVID   |:RXVER|:RXTYP|///////////////////////////|
*     +-------------+------+------+---------------------------+
*   8 |///////////////////////////| C
*     +---------------------------+
*
*** Overlay for LLXID in LLXBK
          
*** LLXITEM - Link Layer Index Table entry
*
*     +---------------------------+
*   0 |          LLXPTR           | 4
*     +---------------------------+
*
*** LLXITEM - Link Layer Index Table entry

LLXBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
LLX_EXP        0000 00000002
LLX_INCR       000A 00000008
LLX_INIT       000A 00000001
LLX_MAX        000A 000003E8
LLXCOUNT       000A
LLXHDRLN       000A 0000000C
LLXID          0000
LLXLIST        000A 0000000C
LLXMAC         0000
LLXMAX         0008
LLXNEXT        0000 00000004
LLXPTR         0000
LLXPTRLN       0000 00000004
LLXPTR1        000C
LLXRXID        0000
LLXRXTYP       0003
LLXRXVER       0002
LLXRXVID       0000