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GR2K-GA-1002 2-31
Rev 6.03
2.4.2.5 Crossbar Switch (CSW)
The CSW provides highspeed packet transfer between the RM and the RP on the
models of GR2000-6H, GR2000-10H and GR2000-20H.
On GR2000-6H, the CSW is included in the RM-CPU board. Its 3-by-3 crossbar
switch performs highspeed packet transfer between RM and up to 3 RPs.
On GR2000-10H, the CSW is included in the RM-CPU board. Its 6-by-6 crossbar
switch performs highspeed packet transfer between RM and up to 5 RPs.
On GR2000-20H, the CSW is implemented as two separate boards (CSWM and
CSWS), one acting as backup. Its 11-by-11 crossbar switch performs highspeed
packet transfer between RM and up to 10 RPs.
2.4.3 Routing Processor Module(RP)
TheRPusestheroutingtablefromtheRPtoperformpacketrelay,ARPandICMP
processing, NIF control, protocol handling on the data link layers (for PPP, frame
relay, and ATM), statistics, and fault handling, etc. The GR2000-6H, GR2000-10H,
and GR2000-20H use the load distribution method to allow the use of more than one
RP simultaneously.
The RP contains a packet forwarding engine (implemented by an ASIC), a routing/
QoS and filtering table lookup engine (implemented by an ASIC) that performs
hardware-based routing table lookup, and a filtering table and QoS table lookup.
This hardware-based method allows faster IP forwarding and QoS services.
TheRPusessoftwarefornetworklayerhandling(forPPP,framerelay,ATM,etc.),
IPX, packet relay on bridges, statistics, and fault handling.
The RP has two types of RPs: RP-A1 and RP-D for low to high-speed line control and
RP-C for ultrahigh-speed line control. Table 2-4 shows the specifications for each
RP.
The GR2000-2S contains an RP-A1 equivalent.