Technical data

Cisco SM-X Layer 2/3 EtherSwitch Service Module Configuration Guide for Cisco 4451-X ISR
Software Features
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Cisco SM-X Layer 2/3 EtherSwitch Service Module Configuration Guide for Cisco 4451-X ISR
Power over Ethernet (Plus) Features
The Cisco SM-X Layer 2/3 ESM is capable of providing power to connected Cisco pre-standard and IEEE
802.3af-compliant powered devices (PDs) from Power over Ethernet (PoE)-capable ports when the switch
detects that there is no power on the circuit. The ESM supports IEEE 802.3at (PoE+), which increases the
available power for PDs from 15.4 W to 30 W per port. For more information, see the Power over Ethernet
Ports. The PoE plus feature supports the Cisco discovery protocol (CDP) with power consumption reporting
and allows the PDs to notify the amount of power consumed. The PoE plus feature also supports the Link
layer discovery protocol (LLDP).
Cisco Intelligent Power Management
The PDs and the switch negotiate power through CDP messages for an agreed power-consumption level.
The negotiation allows high-power Cisco PDs to operate at their highest power mode.
The PoE plus feature enables automatic detection and power budgeting; the switch maintains a power bud-
get, monitors, and tracks requests for power, and grants power only when it is available. See the Configuring
the External PoE Service Module Power Supply Mode section in the Catalyst 3560 Switch Software Configu-
ration Guide, Cisco IOS Release 15.0(2)SE and Later.
Power Policing (Sensing)
Power policing allows to monitor the real-time power consumption. On a per-PoE port basis, the switch
senses the total power consumption, polices the power usage, and reports the power usage. For more infor-
mation on this feature, see Monitoring Real-Time Power Consumption (Power Sensing), page 15.
Managing the Cisco SM-X Layer 2/3 ESM Using Cisco IOS Software
This sections contains the following topics with information on managing the Cisco SM-X Layer 2/3
ESM on the Cisco 4451-X ISR using Cisco IOS software:
• Using OIR to Manage the Cisco SM-X Layer 2/3 ESM, page 5
• Managing MGF Ports for Layer 2 Features, page 7
• Internal Port Mapping, page 7
Using OIR to Manage the Cisco SM-X Layer 2/3 ESM
The online insertion and removal (OIR) feature allows you to insert or remove your Cisco SM-X Layer
2/3 ESM from a Cisco 4451-X ISR without powering down the module. This process is also referred to
as a surprise or hard OIR. When performing a surprise OIR, you must save all your configuration on the
ESM; any unsaved configuration will be lost during a surprise OIR. The Cisco 4451-X ISR also supports
any-to-any OIR, which means that a service module (SM) in a slot can be replaced by another SM using
the OIR feature.
When a module is inserted, power is available on the ESM, and it initializes itself to start functioning.
The hot-swap functionality allows the system to determine when a change occurs in the unit’s physical
configuration and to reallocate the unit's resources to allow all interfaces to function adequately. This
feature allows interfaces on the ESM to be reconfigured while other interfaces on the router remain
unchanged. The software performs the necessary tasks involved in handling the removal and insertion of
the ESM.