Cisco 4G-LTE-ANTM-O-3 Installation Guide download pdf (Page 157)

The authentication command under switch trunk interface mode is enabled for the NEAT feature. This

is available with Cisco IOS Release 15.2T.

Note

Spanning Tree Protocol

For information on Spanning Tree Protocol, see:

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gt1636nm.html#wp1048458

Cisco Discovery Protocol

Cisco Discovery Protocol (CDP) runs over Layer 2 (the data link layer) on all Cisco routers, bridges, access

servers, and switches. CDP allows network management applications to discover Cisco devices that are

neighbors of already known devices, in particular, neighbors running lower-layer, transparent protocols. With

CDP, network management applications can learn the device type and the SNMP agent address of neighboring

devices. This feature enables applications to send SNMP queries to neighboring devices.

CDP runs on all LAN and WAN media that support Subnetwork Access Protocol (SNAP). Each CDP-configured

device sends periodic messages to a multicast address. Each device advertises at least one address at which

it can receive SNMP messages. The advertisements also contain the time-to-live, or hold-time information,

which indicates the length of time a receiving device should hold CDP information before discarding it.

Switched Port Analyzer

For information on Switched Port Analyzer, see:

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gt1636nm.html#wp1053663

IGMP Snooping

For information on IGMP Snooping, see:

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gt1636nm.html#wp1053727

IGMP Version 3

The Cisco 880 series ISRs support Version 3 of IGMP snooping.

IGMPv3 provides support for source filtering, which enables a multicast receiver host to signal to a router

from which groups the receiver host is to receive multicast traffic, and from which sources this traffic is

expected. Enabling the IGMPv3 feature with IGMP snooping on Cisco ISRs provides Basic IGMPv3 Snooping

Support (BISS). BISS provides constrained flooding of multicast traffic in the presence of IGMPv3 hosts.

This support constrains traffic to approximately the same set of ports as IGMPv2 snooping does with IGMPv2

hosts. The constrained flooding only considers the destination multicast address.

Cisco 800 Series Integrated Services Routers Software Configuration Guide

OL-31704-02 129

Configuring Ethernet Switches

Spanning Tree Protocol

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Cisco 4G-LTE-ANTM-O-3 Installation Guide Page 157