JetNet 6524G, the 19-inch 24 ports Gigabit Stackable Layer 3 Managed Ethernet Switch, is equipped with 24 10/100/1000 Base-TX, 4 optional Gigabit SFP combo to the last 4 ports and it supports 2 10Gigabit CX4 Connector. With the installation of stacking cable, up to 8 units can be stacked together, and the backplane of the stacked JetNet 6524Gs is 40G. JetNet 6524G supports up to 192 Gigabit ports and 384G bandwidth.

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Stack Management
The stacked JetNet 6524G management interface allows users to manage through single console interface or remotely manage through single IP address. Using one IP to manage all 192 ports is available and easy for administrators. The stack management feature also allows users to configure the precedence of each stack member. By assigning different precedence to different stack members, users could choose the management (Master) unit of the stack. If the precedence of one stack member is disabled, this stack member will always be a slave unit.

Layer 3 Routing
JetNet 6524G IP routing layers include the IP forwarding layer, Address Resolution Protocol (ARP) mapping layer, and Routing Tables. With IP forwarding table, the JetNet 6524G provides wire speed IP and VLAN inter-routing. One JetNet 6524G allows users to configure multiple IP subnets, and it assigns the IP subnets to the physical interface. The routing table is updated according to the routing information defined by configured static route or learnt by dynamic Routing Protocols. The dynamic Routing Protocols JetNet 6524G supports are RIPv1, v2, OSPFv1 and V2.

Multicast forwarding and Routing are also important in industrial environment. JetNet 6524G supports IGMP snooping for layer 2 multicast filtering, IGMP router port selection. Dynamic multicast routing protocols to route multicast streams through different subnets, include the IGMPv1,v2,v3, DVMRP, PIM-DM, PIM-SM. With these abundant features, JetNet 6524G acts as access switch or aggregated switch so that the clients can be divided into different subnets for wire speed routing and exchange routing information with other L3 routers/switches.

What is Layer 3 Switch?

Layer 3 means the 3rd level of the OSI 7 layers. It is known as IP layer. Layer 3 switch is also known as Multi-Layer switch which include the wire-speed layer 2 MAC switching and layer 3 IP routing capability. There are some scenes that need to plan the layer 3 switch/router in the network topology. 1. The hosts located in different Broadcast domain cannot communicate by themselves. 2. VLAN-enabled switches cannot forward traffic across VLAN boundaries by themselves. 3. Each IP Subnet is single broadcast domain. 4. The unknown target destination address can be directed to default gateway. 5. Users in different IP Subnet/VLAN cannot access the same Public Server. 6. HTTP, FTP, Video, Movie, etc can not be directed to target users through remote service provider.

Routing Protocol
Routing is the process of moving packets through an networks, such as the Internet. To Route traffic, a router or layer 3 switch needs to know the destination IP address or sources that IP it can learn from the possible routes to find the best route, maintain and verify routing information.
If the next hop address is known or assigned by IT manager or service provider, the static route can direct the correct routing request to the connected interface. If not, the dynamic routing protocol is required.

The dynamic routing protocol includes unicast routing and multicast routing protocols. The unicast routing protocol includes hop based or distance vector based. RIP is the typical hop based; the less hops path is always the best route. OSPF is the typical distance vector base, which is the best route path for the lowest cost.
To route multicast services, such as movies, videos, industrial automation streams, the multicast routing and related protocols are needed. The DVMRP, PIM-DM, PIM-SM are supported by JetNet 6524G series.

Advantage of the Stack Management
The Stack Management feature provides abundant advantages for management. It simplifies the management interface, and reduces the number of IP addresses needed in a network. One out-of-band console interface controls whole stack as one switch and single configuration file.
When one New unit joins, leaves or when one stack cable accidentally disconnects, the existed traffic transmission will not be affected with no topology recovery problem. When the master switch of the stack fails, the stack will also recover immediately.


JetNet 6524G supports up to 8 switches per stack, maximum 192 gigabit ports per stack. JetNet 6524G is equipped with dual 10G interface as the backplane between the units. Thus, 40G backplane and less header wasted must decrease the bottleneck effects when inter-switching traffic is heavy.
With high stackability, secured stack cable, and 10G stack backplane, users can easily and flexibly expand the gigabit port volume without changing environment.

VRRP (Virtual Router Redundancy Protocol)

When the source host and the destination host are not in the same segment/subnet, the source host sends data to default gateway first. The hosts must have their own IP, subnet mask and default gateway. The VRRP (Virtual Router Redundancy Protocol) is also known as default gateway redundancy. With VRRP, the hosts can continuously direct traffic to the default gateway without changing default gateway configuration. Once the VRRP master failures, the backup VRRP router will start up immediately. The TCP connection would not be terminated within short failover time, and the hosts would not be aware of the failure of default gateway. The VRRP is a standard protocol and it ensures the highly reliable environment.