Accommodating Voice Traffic on Campus Switches
Voice considerations in campus submodules

Deploying IP telephony in the enterprise campus requires the implementation of various features particular to each submodule.

Building Access Submodule
Within the Building Access submodule, these features support IP telephony:

  • Voice VLANs
  • 802.1p/Q
  • Hardware support for multiple output queues
  • Hardware support for in-line power to IP phones
  • PortFast
  • Root Guard
  • Unidirectional Link Detection (UDLD)
  • UplinkFast

Building Distribution Submodule
Within the Building Distribution submodule, these features support IP telephony:

  • Passive interfaces
  • Layer 3 redundancy with Hot Standby Router Protocol (HSRP), HSRP track, and HSRP preempt
  • OSPF or Enhanced Interior Gateway Routing Protocol (EIGRP) routing with adjusted timers, summary addresses, and path costs