Deployment Guide

23 VxRail Networking Guide with Dell EMC S4148-ON Switches | version 1.0
4.3.2 ISL port channel configuration without VLT
Static link aggregation groups (LAGs) establish ISL links between switches. These links between switches
require the addition of the port channel created for the ISL to all interface VLANs defined for the network.
This topology establishes network redundancy at both the link and the switch level. Failure of a single-switch
or network link does not cause an overall loss of communication.
Configure the Inter-Switch Links (ISLs) for dual-switch topologies using the following commands for Switch 1
and Switch 2: (recommended port values shown).
Dual-Switch ISL
Switch-1 (S4148-ON)
Switch-2 (S4148-ON)
interface port-channel 100
description " ISL to switch 2"
switchport mode trunk
switchport trunk allowed vlan 110,120,130
no shutdown
interface ethernet 1/1/29
description "ISL to switch 2"
channel-group 100 mode active
no shut
interface ethernet 1/1/30
description "ISL to switch 2"
channel-group 100 mode active
no shut
interface port-channel 100
description "ISL to switch 1"
switchport mode trunk
switchport trunk allowed vlan 110,120,130
no shutdown
interface ethernet 1/1/29
description "ISL to switch 1"
channel-group 100 mode active
no shut
interface ethernet 1/1/30
description "ISL to switch 1"
channel-group 100 mode active
no shut
4.3.3 ISL port channel with VLT configuration
In this example, two Dell EMC S4148F-ON switches are connected with a VLTi port-channel. VLT is a layer 2
multipathing technology that allows for running a loop-free L2 multipath network without any blocked ports.
The VLTi synchronizes layer 2 table information between the switches and makes the switch appear as one
logical unit. Usually a server connects to the pair of VLT switches with a LACP LAG, however, LACP is not
used with VxRail nodes as the nodes are configured with a virtual switch with active and standby adapters.
Other non-VxRail devices can utilize LACP LAG to the pair of VLT switches, for an active/active L2
multipathing scenario.
Use VRRP for gateway redundancy with vSAN and management VLANs. VRRP is an active/standby first
hop redundancy protocol (FHRP) when used among VLT peers, it becomes active/active. Both VLT peers
have the VRRP virtual MAC address in their FIB table as local destination address; this allows the backup
VRRP router to forward intercepted frames whose destination MAC address matches the VRRP virtual MAC
address.