The JetNet 7850G-2XG is a 19-inch Gigabit Layer 3 Managed Switch, equipped with 48 10/100/1000 Base- TX ports including 2 x 1/10 GbE dual speed SFP+ ports delivering maximum throughput and flexibility for high-density and ultra high-speed connection. In addition to the 100-240VAC power-based JetNet 7850G-2XG model, Korenix provides the JetNet 7850G-2XG series, which support 48V power inputs and feature a design with -10~55oC wide operating temperature for severe industrial applications.
Triple Layer 3 Routing (IP, VLAN and Multicast routing)
The JetNet 7850G-2XG IP routing layer contains the IP forwarding layer, Address Resolution Protocol (ARP) mapping layer and Routing Tables.With IP forwarding table, the JetNet 7850G-2XG provides wire speed IP and VLAN inter-routing.A single JetNet 7850G-2XG allows users to configure multiple IP subnets and assign them to the physical interface.The routing table can be updated according to the routing information defined by configured static route or learnt by dynamic Routing Protocols.
The dynamic Routing Protocols supported by JetNet 7850G-2XG are RIPv1, v2, OSPFv1 and V2. Aiming to route multicast streams such as movies, videos, industrial automation streams through different subnets, in addition to IP and VLAN routing, thedynamic multicast routing protocols, such as PIM-DM and PIMSM, DVMRP , IGMP v1/v2/v3, are needed. Korenix JetNet 7850G-2XG outstands from other layer 3 switches by its multicast routing feature. With IGMP snooping and IGMP router port selection protocols, the JetNet 7850G-2XG acts as an access level switch or aggregated switch, so that the clients can be divided into different subnets for wire speed routing and for exchanging 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 includes the wire-speed layer 2 MAC switching and layer 3 IP routing capabilities.
Routing is the process of moving packets through an internetwork, such as the Internet. To Route traffic, a router or layer 3 switch needs to know the destination IP address, the sources IP it can learn from, the possible routes. Besides, it should 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 needed.
The dynamic routing protocol includes unicast routing and multicast routing protocols. The unicast routing protocol includes hop based or distance vector based protocols. RIP is the typical hop based protocol, where the less hops path is always the best route. OSPF is a typical distance vector based protocol, where the lowest cost is the best route path. To route multicast services, like 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.
VRRP (Virtual Router Redundancy Protocol)
When the source host and the destination host are not on the same segment/subnet, the source host sends the data to the 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 failure happens, the backup VRRP router activates immediately. The TCP connection will not be terminated within short failover time, the hosts will not aware the default gateway failure. The VRRP is a standard protocol and ensures the high reliability of the environment.