Netgear RPS4000-200NES Datasheet download pdf (Page 10)

Open Shortest Path First (OSPF) link-state protocol

for IPv4 and IPv6

• For IPv4 networks, OSPF version 2 is supported in accordance with RFC 2328, including compatibility

mode for the RFC 1583 older speciﬁcation

• For IPv6 networks, OSPF version 3 is fully supported

• OSPF can operate within a hierarchy, the largest entity within the hierarchy is the autonomous system

(AS)

• An AS is a collection of networks under a common administration sharing a common routing strategy

(routing domain)

• An AS can be divided into a number of areas or groups of contiguous networks and attached hosts

• Two dierent types of OSPF routing occur as a result of area partitioning: Intra-area and Inter-area

• Intra-area routing occurs if a source and destination are in the same area

• Inter-area routing occurs when a source and destination are in dierent areas

• An OSPF backbone distributes information between areas

Advanced OSPF implementation for large

routing domains

• OSPF NSSA feature supports RFC 3101, The OSPF Not-So-Stubby Area (NSSA) Option

• Forwarding of OSPF Opaque LSAs is enabled by default

• Passive interface feature can disable sending OSPF routing updates on an interface

• Static Area Range Costs feature allows to conﬁgure a ﬁxed OSPF cost that is always advertised when an

area range is active

• OSPF Equal Cost Multipath (ECMP) feature allows to forward trac through multiple paths, taking

advantage of more bandwidth

• ECMP routes can be learned dynamically, or conﬁgured statically with multiple static routes to same

destination but with dierent next hops

• OSPF Max Metric feature allows to to override the metric in summary type 3 and type 4 LSAs while in

stub router mode

• Automatic Exiting of Stub Router Mode feature allows to exit stub router mode, reoriginating the router

LSA with proper metric values on transit links

• Static Area Range Costs feature allows to conﬁgure a ﬁxed OSPF cost that is always advertised when an

area range is active

OSPF LSA Pacing feature improves the eciency of

LSA ﬂooding, reducing or eliminating the packet drops

caused by bursts in OSPF control packets

• LSA transmit pacing limits the rate of LS Update packets that OSPF can send

• With LSA refresh groups, OSPF eciently bundles LSAs into LS Update packets when periodically

refreshing self-originated LSAs

OSPF Flood Blocking feature allows to disable LSA

ﬂooding on an interface with area or AS (domain-

wide) scope

• In that case, OSPF does not advertise any LSAs with area or AS scope in its database description packets

sent to neighbors

OSPF Transit-Only Network Hiding is supported based

on RFC 6860 with transit-only network deﬁned as a

network connecting only routers

• Transit-only networks are usually conﬁgured with routable IP addresses which are advertised in LSAs but

are not needed for data trac

• If router-to-router subnets are advertised, remote attacks can be launched against routers by sending

packets to these transit-only networks

• Hiding transit-only networks speeds up network convergence and reduces vulnerability to remote

attacks

• ‘Hiding’ implies that the preﬁxes are not installed in the routing tables on OSPFv2 and OSPFv3 routers

IP Multinetting allows to conﬁgure more than one IP address on a network interface (other vendors may call it IP Aliasing or Secondary Addressing)

ICMP Throttling feature adds conﬁguration options for

the transmission of various types of ICMP messages

• ICMP Redirects can be used by a malicious sender to perform man-in-the-middle attacks, or divert pack-

ets to a malicious monitor, or to cause Denial of Service (DoS) by blackholing the packets

• ICMP Echo Requests and other messages can be used to probe for vulnerable hosts or routers

• Rate limiting ICMP error messages protects the local router and the network from sending a large number

of messages that take CPU and bandwidth

ProSAFE® LAN Access and Aggregation Chassis Switches Data Sheet

M6100 series

Page 10 of 46

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Netgear RPS4000-200NES Datasheet Page 10

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