VSC7511 datasheet(74/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

The following table lists the standard frame types, with respect to CPU forwarding, that are recognized by

the classifier.

In addition, the classifier can recognize Versatile Register Access Protocol (VRAP) frames and redirect

such frames to the CPU. This is a proprietary frame format, which is used for reading and writing switch

configuration registers through ethernet frames. For more information, see VRAP Engine, page 148.

To determine if a frame is a VRAP frame, the VRAP filter in the classifier performs three checks:

•

VLAN check. The filter can be either VLAN unaware or VLAN aware

(ANA::VRAP_CFG.VRAP_VLAN_AWARE_ENA). If VLAN unaware, VRAP frames must be

untagged. If VLAN aware, VRAP frames must be VLAN tagged and the frame’s VID must match a

configured value (ANA::VRAP_CFG.VRAP_VID). Double VLAN tagged frames always fail this

check.

•

EtherType and EPID check. The EtherType must be 0x8880 and the EPID must be 0x0004 (bytes 0

and 1 after the EtherType).

•

VRAP header check. The VRAP header (bytes 0, 1, 2, and 3 after the EPID) must match a 32-bit

configured value (ANA::VRAP_HDR_DATA) where any bits can be don’t cared by a mask

(ANA::VRAP_HDR_MASK).

If all three checks are fulfilled, frames are redirected to CPU extraction queue

ANA::CPUQ_CFG2.CPUQ_VRAP.

The VRAP filter is enabled in ANA:PORT:CPU_FWD_CFG.

Table 32 •

Frame Type Definitions for CPU Forwarding

Frame

Condition

Copy/Redirect

BPDU frames.

Reserved Addresses

(IEEE 802.1D 7.12.6)

DMAC = 0x0180C2000000 to 0x0180C20000F (BPDUs

and various Slow protocols supporting spanning tree, link

aggregation, port authentication)

Redirect/Copy/Discard

Reserved ALLBRIDGE

address

DMAC = 0x0180C2000010

Redirect/Copy/Discard

GARP Application Addresses

(IEEE 802.1D 12.5)

DMAC = 0x0180C2000020 to 0x0180C200002F

Redirect/Copy/Discard

CCM/Link Trace Addresses

(IEEE P802.1ag)

DMAC = 0x0180C2000030 to 0x0180C200003F

Redirect/Copy/Discard

IGMP

DMAC = 0x01005E000000 to 0x01005E7FFFFF

EtherType = IPv4

IP Protocol = IGMP

Redirect

MLD

DMAC = 0x333300000000 to 0x3333FFFFFFFFF

EtherType = IPv6

IPv6 Next Header = 0

Hop-by-hop options header with the first option being a

Router Alert option with the MLD message (Option

Type = 5, Opt Data Len = 2, Option Data = 0).

Redirect

IPv4 Multicast Ctrl

DMAC = 0x01005E000000 to 0x01005E7FFFFF

EtherType = IPv4

IP protocol is not IGMP

IPv4 DIP inside 224.0.0.x

Copy

Source port

All frames received on enabled ingress port

Copy

All other frames

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