Netgear RPS4000-200NES Datasheet download pdf (Page 9)

DHCP Relay Agents relay DHCP requests from any

routed interface, including VLANs, when DHCP server

doesn’t reside on the same IP network or subnet

• The agent relays requests from a subnet without a DHCP server to a server or next-hop agent on

another subnet

• Unlike a router which switches IP packets transparently, a DHCP relay agent processes DHCP messages

and generates new DHCP messages

• Supports DHCP Relay Option 82 circuit-id and remote-id for VLANs

• Multiple Helper IPs feature allows to conﬁgure a DHCP relay agent with multiple DHCP server

addresses per routing interface and to use dierent server addresses for client packets arriving on

dierent interfaces on the relay agent server addresses for client packets arriving on dierent

interfaces on the relay agent

Virtual Router Redundancy Protocol (VRRP) provides

backup for any statically allocated next-hop router

address going down, based on RFC 3768 (IPv4)

• VRRP is based on the concept of having more than one router recognize the same router IP address

• VRRP increases the availability of the default path without requiring conﬁguration of dynamic routing, or

router discovery protocols on end stations

• Multiple virtual routers can be deﬁned on any single router interface

• One of the routers is elected the master router and handles all trac sent to the speciﬁed virtual router IP

address

• When the master router fails, one of the backup routers is elected in its place and starts handling trac

sent to the address

As an enhancement to RFC 3768, VRRP Interface

can be conﬁgured as pingable to help troubleshoot

network connectivity issues

• In that case, VRRP master responds to both fragmented and unfragmented ICMP echo requests packets

destined to VRRP address(es)

• VRRP master responds with VRRP address as the source IPv4 address and VRMAC as the source MAC

address

• A virtual router in backup state discards these ICMP echo requests

VRRP Route/Interface Tracking feature extends the

capability of the Virtual Router Redundancy Protocol

(VRRP)

• Allows tracking of speciﬁc route/interface IP states, within the router, that can alter the priority level of a

virtual router for a VRRP group

• It ensures the best VRRP router is master for the group

Router Discovery Protocol is an extension to ICMP

and enables hosts to dynamically discover the IP

address of routers on local IP subnets

• Based on RFC 1256 for IPv4

• Routers periodically send router discovery messages to announce their presence to locally-attached hosts

• The router discovery message advertises one or more IP addresses on the router that hosts can use as

their default gateway

• Hosts can send a router solicitation message asking any router that receives the message to immediately

send a router advertisement

• Router discovery eliminates the need to manually conﬁgure a default gateway on each host

• It enables hosts to switch to a dierent default gateway if one goes down

Loopback interfaces are available as dynamic, stable IP addresses for other devices on the network, and for routing protocols

Tunnel interfaces are available for IPv4 and IPv6 • Each router interface (port, or VLAN interface) can have multiple associated tunnel interfaces

• Support for Conﬁgured 6to4 (RFC 4213) and Automatic 6to4 tunneling (RFC 3056) for IPv6 trac

encapsulation into IPv4 packets

• 6to4 tunnels are automatically formed for IPv4 tunnels carrying IPv6 trac

• M6100 can act as a 6to4 border router that connects a 6to4 site to a 6to4 domain

Support of Routing Information Protocol (RIPv2)

as a distance vector protocol speciﬁed in RFC 2453

for IPv4

• Each route is characterized by the number of gateways, or hops, a packet must traverse to reach its

intended destination

• Categorized as an interior gateway protocol, RIP operates within the scope of an autonomous system

Route Redistribution feature enables the exchange of

routing information among dierent routing protocols

all operating within a router

• Conﬁgurable when dierent routing protocols use dierent ways of expressing the distance to a destination

or dierent metrics and formats

• For instance, when OSPF redistributes a route from RIP, and needs to know how to set each of the route’s

path attributes

ProSAFE® LAN Access and Aggregation Chassis Switches Data Sheet

M6100 series

Page 9 of 46

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