Reference Guide

Table Of Contents
VLT Terminology................................................................................................................................................... 845
Configure Virtual Link Trunking............................................................................................................................ 846
Important Points to Remember...................................................................................................................... 846
Configuration Notes....................................................................................................................................... 847
Primary and Secondary VLT Peers................................................................................................................ 850
RSTP and VLT.................................................................................................................................................850
VLT Bandwidth Monitoring.............................................................................................................................851
VLT and Stacking............................................................................................................................................851
VLT and IGMP Snooping................................................................................................................................ 851
VLT IPv6..........................................................................................................................................................851
VLT Port Delayed Restoration........................................................................................................................ 852
PIM-Sparse Mode Support on VLT................................................................................................................ 852
VLT Routing ................................................................................................................................................... 854
Non-VLT ARP Sync.........................................................................................................................................856
RSTP Configuration...............................................................................................................................................856
Preventing Forwarding Loops in a VLT Domain............................................................................................. 856
Sample RSTP Configuration........................................................................................................................... 857
Configuring VLT.............................................................................................................................................. 857
eVLT Configuration Example.................................................................................................................................867
eVLT Configuration Step Examples................................................................................................................ 867
PIM-Sparse Mode Configuration Example...........................................................................................................869
Verifying a VLT Configuration............................................................................................................................... 870
Additional VLT Sample Configurations................................................................................................................. 873
Configuring Virtual Link Trunking (VLT Peer 1)Configuring Virtual Link Trunking (VLT Peer 2)Verifying a
Port-Channel Connection to a VLT Domain (From an Attached Access Switch)...........................................873
Troubleshooting VLT.............................................................................................................................................875
Reconfiguring Stacked Switches as VLT..............................................................................................................877
57 Virtual Router Redundancy Protocol (VRRP)....................................................................879
VRRP Overview.....................................................................................................................................................879
VRRP Benefits.......................................................................................................................................................880
VRRP Implementation........................................................................................................................................... 880
VRRP Configuration.............................................................................................................................................. 881
Configuration Task List...................................................................................................................................881
Setting VRRP Initialization Delay....................................................................................................................889
Sample Configurations..........................................................................................................................................889
VRRP for an IPv4 Configuration......................................................................................................................889
VRRP in a VRF Configuration..........................................................................................................................894
58 S-Series Debugging and Diagnostics................................................................................899
Offline Diagnostics................................................................................................................................................899
Important Points to Remember...................................................................................................................... 899