In three switchboards new technologies

1. cores switchboards CrossBar technology

Develops along with the core 642-812 switchboard exchange capacity from several dozens Gbps to today several hundred Gbps, the core

switchboard also from shares the main line, the sharing memory way develops to today CrossBar structure.

CrossBar (namely CrossPoint) is called the 642-812 overlapping switching matrix or vertically and horizontally -like the exchange

matrix. It can make up the sharing memory pattern well some insufficiencies. Its superiority displays in following several

aspects:

First, the CrossBar realization relatively is simple. In the sharing exchange overhead construction simplifies line tax

office outpost to the exchange structure 642-812 physical connection as the spot to a connection, realizes conveniently, thus is

easier to guarantee the large capacity switchboard the stability.

Next, CrossBar internal unimpededly fills. A CrossBar schematic drawing like chart shows, so long as simultaneously closes

many overlapping pitch points (CrossPoint), many different ports may simultaneously transmit the data. From this

significance, we thought all CrossBar is unimpededly fills in the 642-812 interior, because it may support at the 642-812 same time all ports

the line fast exchange data.

In supports the CrossBar technology in three switchboards, generally has used two kinds of three exchanges chips: A kind is

may leave 1G, 100000000000000 ports exchange chip; A kind merely leaves the internal high speed connection (often is above

the 10G speed) the CrossBar chip, uses in between each module interconnection.

At present Cisco, Extreme, net merchant and so on Czechoslovakia network, harbor network all has promoted based on the 642-812

CrossBar core switchboard product, but in the market also had very many interior still to use the product which 1G ports

interconnected, mainly was faces to the performance requirement is ordinary, the price quite sensitive user community.





2. Based on hardware line fast access 642-812 control

Along with the network in user quantity increasing, the user needs to information and so on MAC address, IP address, TCP/UDP

end slogan to carry on the control, thus has realized the strict limit local area network resources visit, simultaneously

also uses this function to limit the local area network user visit to network equipment own. Specially recently 12 years

invaded with the threat network resources network virus's appearance, enormously have affected three switchboards stability,

through above control function, while active 642-812 control user service, also effectively have protected own security and the

reliability. This time three switchboards also on the development are "the intelligent multilayer switchboard", mainly has

had the above control function. This kind of switchboard exchange chip supports time processes 64 byte above the content,

therefore may the direct processing ethernet frame MAC address, the IP Baotou, the TCP/UDP Baotou, thus has realized 2 ~ 4

based on the hardware line fast access control. Also has some intelligence control function like 802.1X authentication

agreements the support, through to AAA 642-812 agreement the and so on the RADIUS expansion, achieves to a user stricter control.

3. end-to-end QoS technology

The ASIC technology high speed development causes the low end equipment to have the formidable QoS ability to become

possibly, network QoS starts from the centralism guarantee gradually to the end-to-end guarantee transition. Now, the network

edge equipment already was allowed according to the port, the MAC address, the VLAN information, IP address even higher level

information to distinguish the application 642-812 type, got the priority mark for the data packet (for example to revise IEEE802.1p

or the IPDiffServ territory), the core equipment did not need to apply carries on the recognition, only had carries on the

exchange according to IPDiffServ and IEEE802.1P, and provided the grade of service then. This kind of intelligent QoS

function also is develops based on the chip 64 byte above processing depth.

4. richer agreements supports

Present intelligent multilayer switchboard 642-812 besides support ordinary two agreements, but also supports BGP, IS-IS and so on

the rich route agreement, as well as the PIM group broadcasts the route agreement, the VRRP redundant backup agreement and so

on the many kinds of 2 ~ 4 agreements. Merchant and so on Extreme, harbor even promoted has supported the 50ms cut

telecommunication level ring net technology on the ethernet the related agreement, caused three switchboards to be allowed to

apply in is more complex, requests in a higher environment.

Besides the above some technical changes, three switchboards also support three ports gatherings technology, NTP (network

clock agreement) and so on the function, 11 642-812 does not relate in detail in here. Along with three exchanges and the correlation

technology development, three switchboards products also had very big subdividing, is different according to the function may

divide into the box type 1G 642-812 switchboards, the entire 1G boxes of types three switchboards, machine the posture

modulation three switchboards, will satisfy the different network future the demand.