Data Sheet

ManualsBrandsNETGEAR ManualsComputers & Accessories48x10G/25G SFP28 and 8x100G QSFP28 Managed Switch

Jumbo Frames Support • Jumbo frames enable transporting data in fewer frames to ensure less overhead, lower processing time,

and fewer interrupts. The maximum transmission unit (MTU) size is conﬁgurable per-port (max 9K).

Auto-MDI/MDIX Support • M4500 supports auto-detection between crossed and straight-through cables. Media-Dependent

Interface (MDI) is the standard wiring for end stations, and the standard wiring for hubs and switches is

known as Media- Dependent Interface with Crossover (MDIX).

Unidirectional Link Detection (UDLD) • The UDLD feature detects unidirectional links physical ports by exchanging packets containing information

about neighboring devices. The purpose of the UDLD feature is to detect and avoid unidirectional links. A

unidirectional link is a forwarding anomaly in a Layer 2 communication channel in which a bidirectional link

stops passing trac in one direction.

Expandable Port Conﬁguration • Expandable ports allow you to conﬁgure a 100GbE port in either 4×25/10GbE mode or 1×40GbE mode.

When the 100GbE port is operating in 4×25/10GbE mode, the port operates as four 25/10GbE ports,

each on a separate lane. This mode requires the use of a suitable 4×25GbE to 1×100GbE pigtail cable.

Expandable port capability can be enabled on 100G ports using the CLI command [no] port-mode. A

change to the port mode is made eective immediately.

Port Speed Conﬁguration • M4500-48XF8C provides 48 ports SFP28 pre-conﬁgured for 10Gbps. Port speed can be 25Gbps,

10Gbps or 1Gbps. SFP28 port speed is only conﬁgurable by multiples of 4 ports using the CLI command

[no] port-mode. For instance, conﬁguring Port-1 using (M4500-48XF8C) (Interface 0/1)#port-mode

4x1G is actually setting all ports 1, 2, 3 and 4 at 1Gbps speed. Conﬁguring Port-5 using (M4500-

48XF8C) (Interface 0/5)#port-mode 4x1G is setting all ports 5, 6, 7 and 8 at 1Gbps speed.

VLAN-aware MAC-based Switching • Packets arriving from an unknown source address are sent to the CPU and added to the Hardware Table.

Future packets addressed to or from this address are more eciently forwarded.

Back Pressure Support • On half-duplex links, a receiver may prevent buer overﬂows by jamming the link so that it is unavailable

for additional trac. On full duplex links, a receiver may send a PAUSE frame indicating that the transmitter

should cease transmission of frames for a speciﬁed period. When ﬂow control is enabled, the switch will

observe received PAUSE frames or jamming signals, and will issue them when congested.

Auto Negotiation • Auto negotiation allows the switch to advertise modes of operation. The auto negotiation function

provides the means to exchange information between two switches that share a point-to-point link

segment, and to automatically conﬁgure both switches to take maximum advantage of their transmission

capabilities. The switch enhances auto negotiation by providing conﬁguration of port advertisement. Port

advertisement allows the system administrator to conﬁgure the port speeds that are advertised.

Storm Control • When Layer 2 frames are forwarded, broadcast, unknown unicast, and multicast frames are ﬂooded to

all ports on the relevant virtual local area network (VLAN). The ﬂooding occupies bandwidth, and loads

all nodes connected on all ports. Storm control limits the amount of broadcast, unknown unicast, and

multicast frames accepted and forwarded by the switch. Per-port and per-storm control type (broadcast,

multicast, or unicast), the storm control feature can be conﬁgured to automatically shut down a port when

a storm condition is detected on the port; or to send a trap to the system log. When conﬁgured to shut

down, the port is put into a diagnostic-disabled state. The user must manually re-enable the interface

for it to be operational. When conﬁgured to send a trap, the trap is sent once in every 30 seconds. When

neither action is conﬁgured, the switch rate-limits the trac when storm conditions occur.

Port Mirroring • Port mirroring monitors and mirrors network trac by forwarding copies of incoming and outgoing packets

from up to four source ports to a monitoring port. The switch also supports ﬂow-based mirroring, which

allows you to copy certain types of trac to a single destination port. This provides ﬂexibility—instead

of mirroring all ingress or egress trac on a port the switch can mirror a subset of that trac. You can

conﬁgure the switch to mirror ﬂows based on certain kinds of Layer 2, Layer 3, and Layer 4 information.

The switch supports up to four monitor sessions. Port mirroring, ﬂow based mirroring, RSPAN, and

VLAN mirroring can be conﬁgured at the same time on the switch using dierent sessions IDs and in any

combinations. Any two sessions cannot be identical. Multiple mirroring sessions are supported for all

types of mirroring. A given interface can be used as a source interface for dierent sessions. For example

a mirroring session can be created with source interface as port A and destination interface as port B.

Another session can be created with source interface as port A and destination interface as port C. An

interface cannot be conﬁgured as a destination interface for more than one session. An IP/MAC access-list

can be attached to any mirroring session or to all sessions at the same time.

sFlow • sFlow is the standard for monitoring high-speed switched and routed networks. sFlow technology is built

into network equipment and gives complete visibility into network activity, enabling eective management

and control of network resources. The switch supports sFlow version 5.

Static and Dynamic MAC Address Tables • You can add static entries to the switch’s MAC address table and conﬁgure the aging time for entries in the

dynamic MAC address table. You can also search for entries in the dynamic table based on several dierent

criteria.

100GE-Enabled Managed Switches Data Sheet

M4500 series

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