Cisco Unified Access CT5760 Guide

Uplink Interface Connectivity
Configure Uplink Interface Connectivity
47
Best Practice User Guide for the Catalyst 3850 and Catalyst 3650 Switch Series
Configure an Uplink Interface to Connect to a Distribution Router (or Standalone Distribution
Switch)
Note Use this configuration when connecting the switch stack to two standalone distribution switches (not
configured as a VSS or VPC pair). However, do not use the spanning-tree portfast trunk command for
switch configuration.
• Ensure that the distribution VSS or VPC router side of the connections are configured the same and
that the EtherChannel is configured with the LACP active mode.
• For additional resilience, the configured uplink interfaces should be located on different switches in
the switch stack.
• Use the spanning-tree portfast trunk command to allow the switch side of the uplink to
immediately transition to a spanning-tree forwarding state when the link becomes available, because
routers do not participate in a spanning tree.
Figure 7 shows a switch stack having a separate EtherChannel to each distribution router. Each
EtherChannel is configured as a trunk with VLANs 10, 11, 12, 100, 200, and 999, with the native VLAN
set to 999.
interface GigabitEthernet 1/1/1
description connection to Distribution VSS or VPC switch 1
switchport mode trunk
switchport trunk native vlan 999
switchport trunk allowed vlan 10,11,12,100,200
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet 2/1/1
description connection to Distribution VSS or VPC switch 1
switchport mode trunk
switchport trunk native vlan 999
switchport trunk allowed vlan 10,11,12,100,200
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet 1/1/2
description connection to Distribution VSS or VPC switch 2
switchport mode trunk
switchport trunk native vlan 999
switchport trunk allowed vlan 10,11,12,100,200
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet 2/1/2
description connection to Distribution VSS or VPC switch 2
switchport mode trunk
switchport trunk native vlan 999
switchport trunk allowed vlan 10,11,12,100,200
channel-protocol lacp
channel-group 1 mode active

Cisco Unified Access CT5760 Specifications

General

Brand	Cisco
Model	Unified Access CT5760
Category	Switch
Language	English