Search This Blog

Thursday, October 11, 2018

Design Tips: Guide for choose VLAN Number

Design Tip— To ensure optimal convergence for voice traffic Cisco recommends that VLAN number assignments be mapped such that the most loss-sensitive applications such as voice are assigned the lowest VLAN numbers on each physical interface, as shown in table:



Table Recommendations for VLAN Assignments 

VLAN Function
VLAN Interface
Wired_Voice_VLAN
7
Wireless_Voice_VLAN
57
Wired_Data_VLAN
107
Wireless_Multicast_VLAN
157


Not all VLANs trunked on a specific interface converge at the same time. Cisco IOS throttles the notifications for VLAN loss to the routing process (EIGRP/OSPF) at a rate of one every 100 msec. As an example, if you configure six VLANs per access switch, upon failure of an uplink, fiber traffic on the sixth VLAN converges 500 msec after the first.

No comments:

Post a Comment