SD-WAN traffic shaping and QoS

Use a traffic shaper in a firewall shaping policy to control traffic flow. You can use it to control maximum and guaranteed bandwidth, or put certain traffic to one of the three different traffic priorities: high, medium, or low.

An advanced shaping policy can classify traffic into 30 groups. Use a shaping profile to define the percentage of the interface bandwidth that is allocated to each group. Each group of traffic is shaped to the assigned speed limit based on the outgoing bandwidth limit configured on the interface.

For more information, see the online help on shared policy traffic shaping and interface-based traffic shaping.

Sample topology

Sample configuration

This example shows a typical customer usage where the customer's SD-WAN has two member: wan1 and wan2 and each is 10Mb/s.

An overview of the procedures to configure SD-WAN traffic shaping and QoS with SD-WAN includes:

1. Give HTTP/HTTPS traffic high priority and give FTP low priority so that if there are conflicts, FortiGate will forward HTTP/HTTPS traffic first.
2. Even though FTP has low priority, configure FortiGate to give it a 1Mb/s guaranteed bandwidth on each SD-WAN member so that if there is no FTP traffic, other traffic can use all the bandwidth. If there is heavy FTP traffic, it can still be guaranteed a 1Mb/s bandwidth.
3. Traffic going to specific destinations such as a VOIP server uses wan1 to forward, and SD-WAN forwards with an Expedited Forwarding (EF) DSCP tag 101110.

To configure SD-WAN traffic shaping and QoS with SD-WAN in the GUI:

1. On the FortiGate, add wan1 and wan2 as SD-WAN members, then add a policy and static route.

   See SD-WAN quick start.

2. When you add a firewall policy, enable Application Control.
3. Go to Policy & Objects > Traffic Shapers and edit low-priority.
   1. Enable Guaranteed Bandwidth and set it to 1000 kbps.
4. Go to Policy & Objects > Traffic Shaping Policy and click Create New.
   1. Name the traffic shaping policy, for example, HTTP-HTTPS.
   2. Click the Source box and select all.
   3. Click the Destination box and select all.
   4. Click the Service box and select HTTP and HTTPS.
   5. Click the Outgoing Interface box and select SD-WAN.
   6. Enable both Shared Shaper and Reverse Shaper and select high-priority for both options.
   7. Click OK.
5. Go to Policy & Objects > Traffic Shaping Policy and click Create New.
   1. Name the traffic shaping policy, for example, FTP.
   2. Click the Source box and select all.
   3. Click the Destination box and select all.
   4. Click the Service box and select FTP, FTP_GET, and FTP_PUT.
   5. Click the Outgoing Interface box and select SD-WAN.
   6. Enable both Shared Shaper and Reverse Shaper and select low-priority for both options.
   7. Click OK
6. Go to Network > SD-WAN Rules and click Create New.
   1. Enter a name for the rule, such as Internet.
   2. In the Destination section, click the Address field and select the VOIP server you created in the firewall address.
   3. Under Outgoing Interfaces, select Manual.
   4. For Interface preference, select wan1.
   5. Click OK.
7. Use CLI commands to modify DSCP settings. See the DSCP CLI commands below.

To configure the firewall policy using the CLI:

config firewall policy
    edit 1
        set name "1"
        set srcintf "dmz"
        set dstintf ""virtual-wan-link""
        set srcaddr "all"
        set dstaddr "all"
        set action accept
        set schedule "always"
        set service "ALL"
        set nat enable
    next
end

To configure the firewall traffic shaper priority using the CLI:

config firewall shaper traffic-shaper
    edit "high-priority"
        set maximum-bandwidth 1048576
        set per-policy enable
    next
    edit "low-priority"
        set guaranteed-bandwidth 1000
        set maximum-bandwidth 1048576
        set priority low
        set per-policy enable
    next
end

To configure the firewall traffic shaping policy using the CLI:

config firewall shaping-policy
    edit 1
        set name "http-https"
        set service "HTTP" "HTTPS"
        set dstintf "virtual-wan-link"
        set traffic-shaper "high-priority"
        set traffic-shaper-reverse "high-priority"
        set srcaddr "all"
        set dstaddr "all"
    next
    edit 2
        set name "FTP"
        set service "FTP" "FTP_GET" "FTP_PUT"
        set dstintf "virtual-wan-link"
        set traffic-shaper "low-priority"
        set traffic-shaper-reverse "low-priority"
        set srcaddr "all"
        set dstaddr "all"
    next
end

To configure SD-WAN traffic shaping and QoS with SD-WAN in the CLI:

config system virtual-wan-link
    set status enable
    config members
        edit 1
            set interface "wan1"
            set gateway x.x.x.x
        next
        edit 2
            set interface "wan2"
            set gateway x.x.x.x
        next
    end
    config service
        edit 1
            set name "SIP"
            set member 1
            set dst "voip-server"
            set dscp-forward enable
            set dscp-forward-tag 101110
        next
    end
end

To use the diagnose command to check if specific traffic is attached to the correct traffic shaper:

# diagnose firewall iprope list 100015

policy index=1 uuid_idx=0 action=accept
flag (0):
shapers: orig=high-priority(2/0/134217728) reply=high-priority(2/0/134217728)
cos_fwd=0  cos_rev=0
group=00100015 av=00000000 au=00000000 split=00000000
host=0 chk_client_info=0x0 app_list=0 ips_view=0
misc=0 dd_type=0 dd_mode=0
zone(1): 0 -> zone(2): 36 38
source(1): 0.0.0.0-255.255.255.255, uuid_idx=6,
dest(1): 0.0.0.0-255.255.255.255, uuid_idx=6,
service(2):
        [6:0x0:0/(1,65535)->(80,80)] helper:auto
        [6:0x0:0/(1,65535)->(443,443)] helper:auto

policy index=2 uuid_idx=0 action=accept
flag (0):
shapers: orig=low-priority(4/128000/134217728) reply=low-priority(4/128000/134217728)
cos_fwd=0  cos_rev=0
group=00100015 av=00000000 au=00000000 split=00000000
host=0 chk_client_info=0x0 app_list=0 ips_view=0
misc=0 dd_type=0 dd_mode=0
zone(1): 0 -> zone(2): 36 38
source(1): 0.0.0.0-255.255.255.255, uuid_idx=6,
dest(1): 0.0.0.0-255.255.255.255, uuid_idx=6,
service(3):
        [6:0x0:0/(1,65535)->(21,21)] helper:auto
        [6:0x0:0/(1,65535)->(21,21)] helper:auto
        [6:0x0:0/(1,65535)->(21,21)] helper:auto

FGT_A (root) #

To use the diagnose command to check if the correct traffic shaper is applied to the session:

# diagnose sys session list
session info: proto=6 proto_state=01 duration=11 expire=3599 timeout=3600 flags=00000000 sockflag=00000000 sockport=0 av_idx=0 use=5
origin-shaper=low-priority prio=4 guarantee 128000Bps max 1280000Bps traffic 1050Bps drops 0B
reply-shaper=
per_ip_shaper=
class_id=0 shaping_policy_id=2 ha_id=0 policy_dir=0 tunnel=/ helper=ftp vlan_cos=0/255
state=may_dirty npu npd os mif route_preserve 
statistic(bytes/packets/allow_err): org=868/15/1 reply=752/10/1 tuples=2
tx speed(Bps/kbps): 76/0 rx speed(Bps/kbps): 66/0
orgin->sink: org pre->post, reply pre->post dev=39->38/38->39 gwy=172.16.200.55/0.0.0.0
hook=post dir=org act=snat 10.1.100.11:58241->172.16.200.55:21(172.16.200.1:58241)
hook=pre dir=reply act=dnat 172.16.200.55:21->172.16.200.1:58241(10.1.100.11:58241)
pos/(before,after) 0/(0,0), 0/(0,0)
misc=0 policy_id=1 auth_info=0 chk_client_info=0 vd=4
serial=0003255f tos=ff/ff app_list=0 app=0 url_cat=0
rpdb_link_id = 00000000
dd_type=0 dd_mode=0
npu_state=0x100000
npu info: flag=0x00/0x00, offload=0/0, ips_offload=0/0, epid=0/0, ipid=0/0, vlan=0x0000/0x0000
vlifid=0/0, vtag_in=0x0000/0x0000 in_npu=0/0, out_npu=0/0, fwd_en=0/0, qid=0/0
no_ofld_reason:  offload-denied helper
total session 1

To use the diagnose command to check the status of a shared traffic shaper:

 # diagnose firewall shaper traffic-shaper list

name high-priority
maximum-bandwidth 131072 KB/sec
guaranteed-bandwidth 0 KB/sec
current-bandwidth 0 B/sec
priority 2
tos ff
packets dropped 0
bytes dropped 0

name low-priority
maximum-bandwidth 131072 KB/sec
guaranteed-bandwidth 125 KB/sec
current-bandwidth 0 B/sec
priority 4
tos ff
packets dropped 0
bytes dropped 0

name high-priority
maximum-bandwidth 131072 KB/sec
guaranteed-bandwidth 0 KB/sec
current-bandwidth 0 B/sec
priority 2
policy 1
tos ff
packets dropped 0
bytes dropped 0

name low-priority
maximum-bandwidth 131072 KB/sec
guaranteed-bandwidth 125 KB/sec
current-bandwidth 0 B/sec
priority 4
policy 2
tos ff
packets dropped 0
bytes dropped 0