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VSC7440 Datasheet(PDF) 284 Page - Microsemi Corporation |
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VSC7440 Datasheet(HTML) 284 Page - Microsemi Corporation |
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284 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 267 3.26.9 VStaX Header Insertion The rewriter controls insertion of the VStaX header. For more information about the header fields, see VStaX Header, page 20. The following registers are used for configuration of the rewriter specific stacking functionality. 3.26.10 Forwarding to GCPU The OQS can redirect CPU frames on selected CPU queues to the external ports instead of sending them to the internal CPU. This is called GCPU forwarding and is typically used if an external CPU is connected to the VSC7440 device through an Ethernet port. Table 186 • Rewriter VStaX Configuration Registers Register Description Replication COMMON_CTRL. OWN_UPSID Configures own UPSID to be used for stacking. None CNT_CTRL. VSTAX_STAT_ESDX_DIS Configures ESDX counting for stacking ports. If this bit is set and PORT_CTRL.VSTAX_HDR_ENA = 1, all counting based on the ESDX value is disabled regardless of the CNT_CTRL.STAT_MODE configuration. None PORT_CTRL. VSTAX_STACK_GRP_SEL Selects logical stacking port (or stacking port group) membership. Ports PORT_CTRL. VSTAX_HDR_ENA Enables insertion of stacking header in frame. Ports PORT_CTRL. VSTAX_PAD_ENA Enables padding of frames to 76 bytes. Setting this bit will cause all frames on the port to be extended to 76 bytes instead of 64 bytes. This should only optionally be enabled for stacking ports (PORT_CTRL.VSTAX_HDR_ENA = 1). Setting this bit will prevent frames from becoming under sized in a receiving switch, when the VStaX header is removed. See ASM::ERR_STICKY.FRAGMENT_STICKY. Ports PORT_CTRL.VSTAX2_MIRR OR_OBEY_WAS_TAGGED Configures tagging of frames with VSTAX.GEN.FWD_MODE = VS2_FWD_GMIRROR. Only active on front ports for frames with this FWD_MODE. This is used to control the remote mirror tagging of frames that have been mirrored from one unit in the stack to another unit. Ports PORT_CTRL. VSTAX2_MISC_ISDX_ENA Configures VSTAX MISC field decoding. Select between MISC- or AC mode. Ports VSTAX_PORT_GRP_CFG. VSTAX_TTL Link TTL value. 2 VSTAX_PORT_GRP_CFG. VSTAX_LRN_ALL_HP_ENA Changes priority of learn all frames to the highest priority (IFH.VSTAX.QOS = 7). 2 VSTAX_PORT_GRP_CFG. VSTAX_MODE Controls whether forwarding modes specific to VStaX AF are translated to BF forwarding modes. If set to 0, the following translation is performed: fwd_logical -> fwd_llookup fwd_mc -> fwd_llookup If set to 1, no translation is performed. Translation is only required for advanced forwarding switches operating in a basic forwarding stack. 2 |
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