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Network topologies for managed FortiSwitch units

July 29, 2019, 1:11 pm
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Network topologies for managed FortiSwitch units

The FortiGate unit requires only one active FortiLink to manage all of the subtending FortiSwitch units (called stacking).

You can configure the FortiLink as a physical interface or as a logical interface (associated with one or more physical interfaces). Depending on the network topology, you can also configure a standby FortiLink.

NOTE: For any of the topologies:

  • All of the managed FortiSwitch units will function as one Layer-2 stack where the FortiGate unit manages each FortiSwitch separately.
  • The active FortiLink carries data as well as management traffic.

Single FortiGate managing a single FortiSwitch unit

On the FortiGate unit, the FortiLink interface is configured as physical or aggregate. The 802.3ad aggregate interface type provides a logical grouping of one or more physical interfaces.

NOTE:

  • For the aggregate interface, you must disable the split interface on the FortiGate unit.
  • When you are using the aggregate interface on the FortiGate unit for the FortiLink interface, the lacp-mode of the FortiLink aggregate interface must be set to static.

Network topologies for managed FortiSwitch units      Single FortiGate unit managing a stack of several

Single FortiGate unit managing a stack of several FortiSwitch units

The FortiGate unit connects directly to one FortiSwitch unit using a physical or aggregate interface. The remaining FortiSwitch units connect in a ring using inter-switch links (that is, ISL).

Optionally, you can connect a standby FortiLink connection to the last FortiSwitch unit. For this configuration, you create a FortiLink Split-Interface (an aggregate interface that contains one active link and one standby link).

NOTE:

  • When you are using the aggregate interface on the FortiGate unit for the FortiLink interface, the lacp-mode of the FortiLink aggregate interface must be set to static.
  • External devices shown in the following topology must be compliant endpoints, such as computers. They cannot be third-party switches or appliances.

HA-mode FortiGate units managing a single FortiSwitch unit

HA-mode FortiGate units managing a single FortiSwitch unit

The master and slave FortiGate units both connect a FortiLink to the FortiSwitch unit. The FortiLink port(s) and interface type must match on the two FortiGate units.

NOTE: When using HA-mode FortiGate units to manage FortiSwitch units, the HA mode must be active-passive.

 

FortiSwitch       HA-mode FortiGate units managing a stack of several FortiSwitch units          units

HA-mode FortiGate units managing a stack of several FortiSwitch units

The master and slave FortiGate units both connect a FortiLink to the first FortiSwitch unit and (optionally) to the last FortiSwitch unit. The FortiLink ports and interface type must match on the two FortiGate units.

For the active/standby FortiLink configuration, you create a FortiLink Split-Interface (an aggregate interface that contains one active link and one standby link).

NOTE:

  • When you are using the aggregate interface on the FortiGate unit for the FortiLink interface, the lacp-mode of the FortiLink aggregate interface must be set to static.
  • When using HA-mode FortiGate units to manage FortiSwitch units, the HA mode must be active-passive.

HA-mode FortiGate units managing a FortiSwitch two-tier

topology                                                                                                                                       FortiSwitch units

HA-mode FortiGate units managing a FortiSwitch two-tier topology

The distribution FortiSwitch unit connects to the master and slave FortiGate units. The FortiLink port(s) and interface type must match on the two FortiGate units.

NOTE: When using HA-mode FortiGate units to manage FortiSwitch units, the HA mode must be active-passive.

Single FortiGate unit managing multiple FortiSwitch units (using a hardware or

FortiSwitch units                                                                                                               software switch interface)

Single FortiGate unit managing multiple FortiSwitch units (using a hardware or software switch interface)

The FortiGate unit connects directly to each FortiSwitch unit. Each of these FortiLink ports is added to the logical hardware-switch or software-switch interface on the FortiGate unit.

Optionally, you can connect other devices to the FortiGate logical interface. These devices, which must support IEEE 802.1q VLAN tagging, will have Layer 2 connectivity with the FortiSwitch ports.

NOTE: Using the hardware or software switch interface in FortiLink mode is not recommended in most cases. It can be used when the traffic on the ports is very light because all traffic across the switches moves through the FortiGate unit.

 

HA-mode FortiGate units managing two-tier FortiSwitch units with Network topologies for managed FortiSwitch access rings          units

HA-mode FortiGate units managing two-tier FortiSwitch units with access rings

HA-mode FortiGate units connect to redundant distribution FortiSwitch units. Access FortiSwitch units are arranged in a stack in each IDF, connected to both distribution switches.

For the FortiLink connection to each distribution switch, you create a FortiLink split interface (an aggregate interface that contains one active link and one standby link).

NOTE:

  • Before FortiSwitchOS 3.6.4, MCLAG was not supported when access rings were present. Starting with FortiSwitchOS 3.6.4, MCLAG is supported, even with access rings present.
  • When using HA-mode FortiGate units to manage FortiSwitch units, the HA mode must be active-passive.
  • When you are using the aggregate interface on the FortiGate unit for the FortiLink interface, the lacp-mode of the FortiLink aggregate interface must be set to static.
  • This is only an example topology. Other combinations of FortiGate units and FortiSwitch units can be used to create a similar topology.

Dual-homed servers connected to FortiLink tier-1 FortiSwitch units using

FortiSwitch units                                                                                                                                    an MCLAG

Dual-homed servers connected to FortiLink tier-1 FortiSwitch units using an MCLAG

To configure a multichassis LAG, you need to configure FortiSwitch 1 and FortiSwitch 2 as MCLAG peer switches before creating a two-port LAG. Use the set mclag-icl enable command to create an inter-chassis link (ICL) on each FortiSwitch unit. Then you set up two MCLAGs towards the servers, each MCLAG using one port from each FortiSwitch unit. You must disable the FortiLink split interface for the FortiGate unit.

This topology is supported when the FortiGate unit is in HA mode.

Standalone FortiGate unit with dual-homed FortiSwitch access

Standalone FortiGate unit with dual-homed FortiSwitch access

This network topology provides high port density with two tiers of FortiSwitch units.

Use the set mclag-icl enable command to create an ICL on each FortiSwitch unit.

 

HA-mode FortiGate units with dual-homed FortiSwitch access

HA-mode FortiGate units with dual-homed FortiSwitch access

In HA mode, only one FortiGate is active at a time. If the active FortiGate unit fails, the backup FortiGate unit becomes active.

Use the set mclag-icl enable command to create an ICL on each FortiSwitch unit.

NOTE: When using HA-mode FortiGate units to manage FortiSwitch units, the HA mode must be active-passive.

Multi-tiered MCLAG with HA-mode FortiGate units

NOTE:

  • When using HA-mode FortiGate units to manage FortiSwitch units, the HA mode must be active-passive.
  • In this topology, you must use the auto-isl-port-group setting as described in the following configuration example. This setting instructs the switches to group ports from MCLAG peers together into one MCLAG when the inter-switch link (ISL) is formed.
  • The inter-chassis link (ICL) and auto-isl-port-group settings must be done directly on the FortiSwitch unit. l CLI commands in red are manually configured.
  • In a two-tier MCLAG topology, disable STP on the first tier MCLAG peer group with the following commands on each peer switch and do not use access-ring connections on first tier MCLAG peer groups:

config switch global

set mclag-stp-aware disable end

To configure a multi-tiered MCLAG with HA-mode FortiGate units:

  1. Configure FortiSwitch-1 for the tier-1 MCLAG:
  2. Enable the ICL on the ISL formed with the MCLAG peer switch:

config switch trunk edit “D243Z14000288-0” // trunk name derived from FortiSwitch-2 SN set mode lacp-active set auto-isl 1

Multi-tiered MCLAG with HA-mode FortiGate

set mclag-icl enable set members “port21” “port22” end

  1. Configure the two auto-isl-port-groups based on the topology diagram. The group name must match the name that is configured on the peer switch.

config switch auto-isl-port-group edit “mclag-core1” set members “port1” “port2” next

edit “mclag-core2” set members “port3” “port4” end

  1. After you complete the CLI commands in Steps 1a and 1b, the trunks are automatically formed:

config switch trunk edit “D243Z14000288-0” set mode lacp-active set auto-isl 1 set mclag-icl enable set members “port21” “port22” next

edit “__FoRtI1LiNk0__” set mclag enable set members “port24” “port23” next

edit “8DN4K16000360-0” // trunk name derived from FortiSwitch-3 SN set mode lacp-active set auto-isl 1 set mclag enable set members “port20” next

edit “mclag-core1” set mode lacp-active set auto-isl 1 set mclag enable set members “port1” “port2” next

edit “mclag-core2” set mode lacp-active set auto-isl 1 set mclag enable set members “port3” “port4” next

end

  1. Configure FortiSwitch-2 for the tier-1 MCLAG:
  2. Enable the ICL on the ISL formed with the MCLAG peer switch:

config switch trunk edit “D243Z14000289-0” // trunk name derived from FortiSwitch-1 SN

set mode lacp-active set auto-isl 1 set mclag-icl enable set members “port21” “port22” end

  1. Configure the two auto-isl-port-groups based on the topology diagram. The group name must match the name that is configured on the peer switch.

config switch auto-isl-port-group edit “mclag-core1” set members “port1” “port2” next

edit “mclag-core2” set members “port3” “port4” end

  1. After you complete the CLI commands in Steps 2a and 2b, the trunks are automatically formed:

config switch trunk edit “D243Z14000288-0” set mode lacp-active set auto-isl 1 set mclag-icl enable set members “port21” “port22” next

edit “__FoRtI1LiNk0__” set mclag enable set members “port24” “port23” next

edit “8DN4K16000360-0” // trunk name derived from FortiSwitch-3 SN set mode lacp-active set auto-isl 1 set mclag enable set members “port20” next

edit “mclag-core1” set mode lacp-active set auto-isl 1 set mclag enable set members “port1” “port2” next

edit “mclag-core2” set mode lacp-active set auto-isl 1 set mclag enable set members “port3” “port4” next

end

  1. Tier-2 MCLAGs. Enable the ICL between the MCLAG peers. For example, configure FortiSwitch-6 as follows.
  2. Change the tier-2 MCLAG peer switches to FortiLink mode and connect them to each other. Enable the ICL on the ISL formed with the MCLAG peer switches.

Multi-tiered MCLAG with HA-mode FortiGate

config switch trunk edit “8DN3X15000026-0” // trunk name derived from FortiSwitch-7 SN set mode lacp-active set auto-isl 1 set mclag-icl enable set members “port43” “port44”

end

  1. The trunks are automatically formed as below:

config switch trunk edit “8DN3X15000026-0” set mode lacp-active set auto-isl 1 set mclag-icl enable set members “port43” “port44”

next

edit “8EP3X17000051-0” // trunk name derived from FortiSwitch-11 SN set mode lacp-active set auto-isl 1 set mclag enable set members “port45”

next

edit “_FlInK1_MLAG0_” set mode lacp-active set auto-isl 1 set mclag enable set members “port48” “port47”

next

edit “8EP3X17000069-0” // trunk name derived from FortiSwitch-12 SN set mode lacp-active set auto-isl 1 set mclag enable set members “port46”

next

end

  1. Access FortiSwitch units. The access switch trunks are formed automatically as below.

On FortiSwitch-11:

config switch trunk edit “_FlInK1_MLAG0_” set mode lacp-active set auto-isl 1 set mclag enable set members “port48” “port47”

next

end

On FortiSwitch-12:

config switch trunk edit “_FlInK1_MLAG0_” set mode lacp-active set auto-isl 1 set mclag enable set members “port47” “port48”

next

end

 

Grouping

Grouping FortiSwitch units

You can simplify the configuration and management of complex topologies by creating FortiSwitch groups. A group can include one or more FortiSwitch units and you can include different models in a group.

config switch-controller switch-group edit <name> set description <string> set members <serial-number> <serial-number> … end

end

Grouping FortiSwitch units allows you to restart all of the switches in the group instead of individually. For example, you can use the following command to restart all of the FortiSwitch units in a group named my-swgroup: execute switch-controller restart-swtp my-switch-group

Upgrading the firmware of FortiSwitch groups is easier, too, because fewer commands are needed. See Firmware upgrade of stacked or tiered FortiSwitch units on page 57.

Stacking configuration

To set up stacking:

  1. Configure the active FortiLink interface on the FortiGate unit.
  2. (Optional) Configure the standby FortiLink interface.
  3. Connect the FortiSwitch units together, based on your chosen topology.

1. Configure the active FortiLink

Configure the FortiLink interface (as described in the FortiLink configuration using the FortiGate GUIchapter).

When you configure the FortiLink interface, the stacking capability is enabled automatically.

2. Configure the standby FortiLink

Configure the standby FortiLink interface. Depending on your configuration, the standby FortiLink might connect to the same FortiGate unit as the active FortiLink or to a different FortiGate unit.

If the FortiGate unit receives discovery requests from two FortiSwitch units, the link from one FortiSwitch unit will be selected as active, and the link from other FortiSwitch unit will be selected as standby.

If the active FortiLink fails, the FortiGate unit converts the standby FortiLink to active.

3. Connect the FortiSwitch units

Refer to the topology diagrams to see how to connect the FortiSwitch units.

Inter-switch links (ISLs) form automatically between the stacked switches.

The FortiGate unit will discover and authorize all of the FortiSwitch units that are connected. After this, the FortiGate unit is ready to manage all of the authorized FortiSwitch units.

Grouping FortiSwitch units

Disable stacking

To disable stacking, execute the following commands from the FortiGate CLI. In the following example, port4 is the FortiLink interface:

config system interface edit port4 set fortilink-stacking disable

end

end

Firmware upgrade of stacked or tiered FortiSwitch units

In this topology, the core FortiSwitch units are model FS-224D-FPOE, and the access FortiSwitch units are model FS-124D-POE. Because the switches are stacked or tiered, the procedure to update the firmware is simpler. In the following procedure, the four FortiSwitch units are upgraded from 3.6.1 to 3.6.2.

To upgrade the firmware of stacked or tiered FortiSwitch units:

  1. Check that all of the FortiSwitch units are connected and which firmware versions they are running. For example:

execute switch-controller get-conn-status

STACK-NAME: FortiSwitch-Stack-port2

SWITCH-ID            VERSION     STATUS               ADDRESS           JOIN-TIME

NAME

S108DV2EJZDAC42F    v3.6.0       Authorized/Up      169.254.2.4        Thu Feb 8 17:07:35 2018

–

S108DV4FQON40Q07    v3.6.0       Authorized/Up      169.254.2.5        Thu Feb 8 17:08:37 2018

–

S108DVBWVLH4QGEB    v3.6.0       Authorized/Up      169.254.2.6        Thu Feb 8 17:09:13 2018

–

S108DVCY19SA0CD8    v3.6.0       Authorized/Up      169.254.2.2        Thu Feb 8 17:04:41 2018

–

S108DVD98KMQGC44* v3.6.0        Authorized/Up      169.254.2.7        Thu Feb 8 17:10:50 2018

–

Grouping

S108DVGGBJLQQO48* v3.6.0 – Authorized/Up 169.254.2.3 Thu Feb 8 17:06:57 2018
S108DVKM5T2QEA92 v3.6.0 – Authorized/Up 169.254.2.8 Thu Feb 8 17:11:00 2018
S108DVZX3VTAOO45 v3.6.0 – Authorized/Up 169.254.2.9 Thu Feb 8 17:11:00 2018
Managed-Switches: 8 UP: 8 DOWN: 0    
  1. Upload the firmware image for each FortiSwitch model (FS-224D-FPOE and FS-124D-POE) from either an FTP or TFTP server. If you are using a virtual domain (VDOM), you must enter the config global command before entering the upload-swtp-image command. For example:

FG100E4Q16004478 (global) # execute switch-controller upload-swtp-image tftp FSW_124D_POEv3-build0382-FORTINET.out 172.30.12.18

Downloading file FSW_124D_POE-v3-build0382-FORTINET.out from tftp server 172.30.12.18… ################## Image checking …

Image MD5 calculating …

Image Saving S124DP-IMG.swtp … Successful!

File Syncing…

FG100E4Q16004478 (global) # execute switch-controller upload-swtp-image tftp FSW_224D_FPOEv3-build0382-FORTINET.out 172.30.12.18

Downloading file FSW_224D_FPOE-v3-build0382-FORTINET.out from tftp server 172.30.12.18… ###################### Image checking …

Image MD5 calculating …

Image Saving S224DF-IMG.swtp … Successful!

File Syncing…

  1. Check which firmware images are available. For example:

FG100E4Q16004478 (root) # execute switch-controller list-swtp-image SWTP Images on AC:

ImageName                  ImageSize(B)    ImageInfo                ImageMTime

S124DP-IMG.swtp           19174985            S124DP-v3.6-build382 Mon Oct 2 14:40:54 2017

S224DF-IMG.swtp     23277106 S224DF-v3.6-build382 Mon Oct 2 14:42:55 2017 4. Stage the firmware image for each FortiSwitch model (FS-224D-FPOE and FS-124D-POE). For example:

FG100E4Q16004478 (root) # execute switch-controller stage-tiered-swtp-image ALL S124DPIMG.swtp

Staged Image Version S124DP-v3.6-build382

FG100E4Q16004478 (root) # execute switch-controller stage-tiered-swtp-image ALL S224DFIMG.swtp

Staged Image Version S224DF-v3.6-build382

  1. Check that the correct firmware image is staged for each FortiSwitch unit. For example:

diagnose switch-controller dump network-upgrade status

Running                                       Status       Next boot

__________________ ________________________________________ _________ __________________ _________

VDOM : root

S108DVCY19SA0CD8 S108DV-v3.6.0-build4277,171207 (Interim) (0/0/0) S108DV-v3.7.0build4277,171207 (Interim)

S108DV2EJZDAC42F S108DV-v3.6.0-build4277,171207 (Interim) (0/0/0)

  1. Restart the FortiSwitch units after a 2-minute delay. For example:

execute switch-controller restart-swtp-delayed ALL

Grouping FortiSwitch units

  1. When the FortiSwitch units are running again, check that they are running the new firmware version. For example:

execute switch-controller get-conn-status

STACK-NAME: FortiSwitch-Stack-port2    
SWITCH-ID NAME VERSION STATUS ADDRESS JOIN-TIME
S108DV2EJZDAC42F – v3.6.0 Authorized/Up 169.254.2.4 Thu Feb 8 17:07:35 2018
S108DV4FQON40Q07 – v3.6.0 Authorized/Up 169.254.2.5 Thu Feb 8 17:08:37 2018
S108DVBWVLH4QGEB – v3.6.0 Authorized/Up 169.254.2.6 Thu Feb 8 17:09:13 2018
S108DVCY19SA0CD8 – v3.6.0 Authorized/Up 169.254.2.2 Thu Feb 8 17:04:41 2018
S108DVD98KMQGC44* – v3.6.0 Authorized/Up 169.254.2.7 Thu Feb 8 17:10:50 2018
S108DVGGBJLQQO48* – v3.6.0 Authorized/Up 169.254.2.3 Thu Feb 8 17:06:57 2018
S108DVKM5T2QEA92 – v3.6.0 Authorized/Up 169.254.2.8 Thu Feb 8 17:11:00 2018
S108DVZX3VTAOO45 – v3.6.0 Authorized/Up 169.254.2.9 Thu Feb 8 17:11:00 2018
Managed-Switches: 8 UP: 8 DOWN: 0    

 

Transitioning from a FortiLink split interface to a FortiLink MCLAG

Transitioning from a FortiLink split interface to a FortiLink MCLAG

In this topology, the FortiLink split interface connects a FortiLink aggregate interface from one FortiGate unit to two FortiSwitch units.

NOTE:

  • This procedure also applies to a FortiGate unit in HA mode. l More links can be added between the FortiGate unit and FortiSwitch unit. l After the MCLAG is set up, only connect the tier-2 FortiSwitch units.
  • When you are using the aggregate interface on the FortiGate unit for the FortiLink interface, the lacp-mode of the FortiLink aggregate interface must be set to static.
  1. Enable the split interface on the FortiLink aggregate interface. By default, the split interface is enabled. For example:

config system interface edit flinksplit1 set ip 169.254.3.1 255.255.255.0 set allowaccess ping capwap https set vlanforward enable set type aggregate set member port4 port5 set lacp-mode static set fortilink enable

set fortilink-split-interface enable

next

end

  1. Log into FortiSwitch 2 using the Connect to CLI button in the FortiGate GUI, use the get switch lldp auto-isl-status command to find out the name of the trunk connecting the peer switches, and change the ISL to an ICL. For example:

get switch lldp auto-isl-status config switch trunk

Transitioning from a FortiLink split interface to a FortiLink MCLAG

edit <trunk_name> set mclag-icl enable

next

end

  1. Log into FortiSwitch 1 using the Connect to CLI button in the FortiGate GUI, use the get switch lldp auto-isl-status command to find out the name of the trunk connecting the peer switches, and change the ISL to an ICL. For example:

get switch lldp auto-isl-status

config switch trunk edit <trunk_name> set mclag-icl enable

next

end

  1. Log into the FortiGate unit and disable the split interface. For example:

config system interface edit flinksplit1 set fortilink-split-interface disable

next

end

  1. Enable the LACP active mode.
  2. Check that the LAG is working correctly. For example:

diagnose netlink aggregate name <aggregate_name>

Optional setup tasks Configuring the FortiSwitch management port Optional setup tasks

This section describes the following tasks:

  • Configuring the FortiSwitch management port on page 62 l Converting to FortiSwitch standalone mode on page 63 l Changing the admin password on the FortiGate for all managed FortiSwitch units on page 63 l Enabling network-assisted device detection on page 64
  • Limiting the number of parallel process for FortiSwitch configuration on page 64

Configuring the FortiSwitch management port

If the FortiSwitch model has a dedicated management port, you can configure remote management to the FortiSwitch. In FortiLink mode, the FortiGate is the default gateway, so you need to configure an explicit route for the FortiSwitch management port.

Using the Web administration GUI

  1. Go to Network > Static Routes > Create New > Route.
  2. Set Destination to Subnet and enter a subnetwork and mask.
  3. Set Device to the management interface.
  4. Add a Gateway IP address.

Using the FortiSwitch CLI

Enter the following commands:

config router static edit 1 set device mgmt set gateway <router IP address> set dst <router subnet> <subnet mask>

end

end

In the following example, the FortiSwitch management port is connected to a router with IP address 192.168.0.10:

config router static edit 1 set device mgmt set gateway 192.168.0.10 set dst 192.168.0.0 255.255.0.0

end end

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