Cisco Catalyst 4500 Series Configuration Guide

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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 45 Configuring the PPPoE Intermediate Agent
RFCs
Enabling PPPoE IA on an Interface
This functionality enables the PPPoE IA feature on an interface. The pppoe intermediate-agent
command has an effect only if the PPPoE IA feature was enabled globally with this command. (You need
to enable globally to activate PPPoE IA static ACL and on an interface for PPPoE IA processing of
PPPoE discovery packets received on that interface.)
This setting applies to all frames passing through this interface, regardless of the VLAN they belong to.
By default the PPPoE IA feature is disabled on all interfaces. You need to run this command on every
interface that requires this feature.
The following example shows how to enable PPPoE IA on FastEthernet 3/1:
Switch> enable
Switch# configure terminal
Switch(config) interface FastEthernet 3/1
Switch(config-if) pppoe intermediate-agent
Note Enabling PPPoE IA on an interface does not ensure that incoming packets are tagged. For this to happen
PPPoE IA must be enabled globally, and at least one interface that connects the switch to PPPoE server
has a trusted PPPoE IA setting. Refer to the following section for details.
Configuring the PPPoE IA Trust Setting on an Interface
This functionality sets a physical interface as trusted. The following example shows how to set
FastEthernet interface 3/2 as trusted:
Switch> enable
Switch# configure terminal
Switch(config) interface FastEthernet 3/2
Switch(config-if) pppoe intermediate-agent trust
This setting is disabled by default.
Note Interfaces that connect the switch to PPPoE server are configured as trusted. Interfaces that
connect the switch to users (PPPoE clients) are untrusted.
Configuring PPPoE IA Rate Limiting Setting on an Interface
This functionality limits the rate (per second) at which PPPoE Discovery packets (PADI, PADO, PADR,
PADS, or PADT) are received on an interface. When the incoming packet rate achieves or exceeds the
configured limit, a port enters an err-disabled state.
The following example shows how to set a rate limit of 30 at FastEthernet 3/1:
Switch> enable
Switch# configure terminal
Switch(config) interface FastEthernet 3/1
Switch(config-if) pppoe intermediate-agent limit rate 30
Note The parameter for rate limiting is the number of packets per second. If the incoming packet rate
exceeds this value, the port shuts down.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E