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27 KiB
27 KiB
Flow Specification
GoBGP supports RFC5575, RFC7674, draft-ietf-idr-flow-spec-v6 and draft-ietf-idr-flowspec-l2vpn.
Prerequisites
Assume you finished Getting Started.
Contents
Configuration
To enable FlowSpec family, please enumerate the corresponding "afi-safi-name" in "neighbors.afi-safis" section like the below.
[[neighbors]]
# ...(snip)...
[[neighbors.afi-safis]]
[neighbors.afi-safis.config]
afi-safi-name = "ipv4-flowspec"
[[neighbors.afi-safis]]
[neighbors.afi-safis.config]
afi-safi-name = "ipv6-flowspec"
[[neighbors.afi-safis]]
[neighbors.afi-safis.config]
afi-safi-name = "l3vpn-ipv4-flowspec"
[[neighbors.afi-safis]]
[neighbors.afi-safis.config]
afi-safi-name = "l3vpn-ipv6-flowspec"
[[neighbors.afi-safis]]
[neighbors.afi-safis.config]
afi-safi-name = "l2vpn-flowspec"
# ...(snip)...
CLI Syntax
IPv4/IPv6 FlowSpec
# Add a route
$ gobgp global rib -a {ipv4-flowspec|ipv6-flowspec} add match <MATCH> then <THEN>
<MATCH> : { destination <PREFIX> [<OFFSET>] |
source <PREFIX> [<OFFSET>] |
protocol <PROTOCOLS>... |
fragment <FRAGMENTS>... |
tcp-flags <TCP_FLAGS>... |
port <ITEM>... |
destination-port <ITEM>... |
source-port <ITEM>... |
icmp-type <ITEM>... |
icmp-code <ITEM>... |
packet-length <ITEM>... |
dscp <ITEM>... |
label <ITEM>... }...
<PROTOCOLS> : [&] [<|<=|>|>=|==|!=] <PROTOCOL>
<PROTOCOL> : egp, gre, icmp, igmp, igp, ipip, ospf, pim, rsvp, sctp, tcp, udp, unknown, <DEC_NUM>
<FRAGMENTS> : [&] [=|!|!=] <FRAGMENT>
<FRAGMENT> : dont-fragment, is-fragment, first-fragment, last-fragment, not-a-fragment
<TCP_FLAGS> : [&] [=|!|!=] <TCP_FLAG>
<TCP_FLAG> : F, S, R, P, A, U, E, C
<ITEM> : [&] [<|<=|>|>=|==|!=] <DEC_NUM>
<THEN> : { accept |
discard |
rate-limit <RATE> [as <AS>] |
redirect <RT> |
mark <DEC_NUM> |
action { sample | terminal | sample-terminal } }...
<RT> : xxx:yyy, xxx.xxx.xxx.xxx:yyy, xxxx::xxxx:yyy, xxx.xxx:yyy
# Show routes
$ gobgp global rib -a {ipv4-flowspec|ipv6-flowspec}
# Delete route
$ gobgp global rib -a {ipv4-flowspec|ipv6-flowspec} del match <MATCH_EXPR>
VPNv4/VPNv6 FlowSpec
# Add a route
$ gobgp global rib -a {ipv4-l3vpn-flowspec|ipv6-l3vpn-flowspec} add rd <RD> match <MATCH> then <THEN> [rt <RT>]
<RD> : xxx:yyy, xxx.xxx.xxx.xxx:yyy, xxx.xxx:yyy
<MATCH> : { destination <PREFIX> [<OFFSET>] |
source <PREFIX> [<OFFSET>] |
protocol <PROTOCOLS>... |
fragment <FRAGMENTS>... |
tcp-flags <TCP_FLAGS>... |
port <ITEM>... |
destination-port <ITEM>... |
source-port <ITEM>... |
icmp-type <ITEM>... |
icmp-code <ITEM>... |
packet-length <ITEM>... |
dscp <ITEM>... |
label <ITEM>...}...
<PROTOCOLS> : [&] [<|<=|>|>=|==|!=] <PROTOCOL>
<PROTOCOL> : egp, gre, icmp, igmp, igp, ipip, ospf, pim, rsvp, sctp, tcp, udp, unknown, <DEC_NUM>
<FRAGMENTS> : [&] [=|!|!=] <FRAGMENT>
<FRAGMENT> : dont-fragment, is-fragment, first-fragment, last-fragment, not-a-fragment
<TCP_FLAGS> : [&] [=|!|!=] <TCP_FLAG>
<TCP_FLAG> : F, S, R, P, A, U, E, C
<ITEM> : [&] [<|<=|>|>=|==|!=] <DEC_NUM>
<THEN> : { accept |
discard |
rate-limit <RATE> [as <AS>] |
redirect <RT> |
mark <DEC_NUM> |
action { sample | terminal | sample-terminal } }...
<RT> : xxx:yyy, xxx.xxx.xxx.xxx:yyy, xxxx::xxxx:yyy, xxx.xxx:yyy
# Show routes
$ gobgp global rib -a {ipv4-l3vpn-flowspec|ipv6-l3vpn-flowspec}
# Delete route
$ gobgp global rib -a {ipv4-l3vpn-flowspec|ipv6-l3vpn-flowspec} del rd <RD> match <MATCH_EXPR>
L2VPN FlowSpec
# Add a route
$ gobgp global rib -a l2vpn-flowspec add rd <RD> match <MATCH> then <THEN> [rt <RT>]
<RD> : xxx:yyy, xxx.xxx.xxx.xxx:yyy, xxx.xxx:yyy
<MATCH> : { destination <PREFIX> [<OFFSET>] |
source <PREFIX> [<OFFSET>] |
protocol <PROTOCOLS>... |
fragment <FRAGMENTS>... |
tcp-flags <TCP_FLAGS>... |
port <ITEM>... |
destination-port <ITEM>... |
source-port <ITEM>... |
icmp-type <ITEM>... |
icmp-code <ITEM>... |
packet-length <ITEM>... |
dscp <ITEM>... |
label <ITEM>... |
destination-mac <MAC_ADDRESS> |
source-mac <MAC_ADDRESS> |
ether-type <ETHER_TYPES>... |
llc-dsap <ITEM>... |
llc-ssap <ITEM>... |
llc-control <ITEM>... |
snap <ITEM>... |
vid <ITEM>... |
cos <ITEM>... |
inner-vid <ITEM>... |
inner-cos <ITEM>... }...
<PROTOCOLS> : [&] [<|<=|>|>=|==|!=] <PROTOCOL>
<PROTOCOL> : egp, gre, icmp, igmp, igp, ipip, ospf, pim, rsvp, sctp, tcp, udp, unknown, <DEC_NUM>
<FRAGMENTS> : [&] [=|!|!=] <FRAGMENT>
<FRAGMENT> : dont-fragment, is-fragment, first-fragment, last-fragment, not-a-fragment
<TCP_FLAGS> : [&] [=|!|!=] <TCP_FLAG>
<TCP_FLAG> : F, S, R, P, A, U, E, C
<ETHER_TYPES> : [&] [<|<=|>|>=|==|!=] <ETHER_TYPE>
<ETHER_TYPE> : aarp, apple-talk, arp, ipv4, ipv6, ipx, loopback, net-bios, pppoe-discovery, pppoe-session, rarp, snmp, vmtp, xtp, <DEC_NUM>
<ITEM> : [&] [<|<=|>|>=|==|!=] <DEC_NUM>
<THEN> : { accept |
discard |
rate-limit <RATE> [as <AS>] |
redirect <RT> |
mark <DEC_NUM> |
action { sample | terminal | sample-terminal } }...
<RT> : xxx:yyy, xxx.xxx.xxx.xxx:yyy, xxxx::xxxx:yyy, xxx.xxx:yyy
# Show routes
$ gobgp global rib -a l2vpn-flowspec
# Delete route
$ gobgp global rib -a l2vpn-flowspec del rd <RD> match <MATCH_EXPR>
Match (Traffic Filtering Rules)
| Type | Key | Operator/Operand Type | Value |
|---|---|---|---|
| 1 | destination | - | IP Prefix (or IP Address). |
| 2 | source | - | IP Prefix (or IP Address). |
| 3 | protocol | Numeric | Protocol name, decimal number, true or false. |
| 4 | port | Numeric | Decimal number, true or false. |
| 5 | destination-port | Numeric | Decimal number, true or false. |
| 6 | source-port | Numeric | Decimal number, true or false. |
| 7 | icmp-type | Numeric | Decimal number, true or false. |
| 8 | icmp-code | Numeric | Decimal number, true or false. |
| 9 | tcp-flags | Bitmask | TCP flag or its combination. |
| 10 | packet-length | Numeric | Decimal number, true or false. |
| 11 | dscp | Numeric | Decimal number, true or false. |
| 12 | fragment | Bitmask | Fragment type or its combination joined with +. |
| 13 | label | Numeric | Decimal number, true or false. |
| 14 | ether-type | Numeric | Ethernet type name, decimal number, true or false. |
| 15 | source-mac | - | MAC address. |
| 16 | destination-mac | - | MAC address. |
| 17 | llc-dsap | Numeric | Decimal number, true or false. |
| 18 | llc-ssap | Numeric | Decimal number, true or false. |
| 19 | llc-control | Numeric | Decimal number, true or false. |
| 20 | snap | Numeric | Decimal number, true or false. |
| 21 | vid | Numeric | Decimal number, true or false. |
| 22 | cos | Numeric | Decimal number, true or false. |
| 23 | inner-vid | Numeric | Decimal number, true or false. |
| 24 | inner-cos | Numeric | Decimal number, true or false. |
Note: IPv4/VPNv4 FlowSpec families support types 1-12, IPv6/VPNv6 FlowSpec families support types 1-13 and L2VPN FlowSpec family supports types 1-24.
Operator/Operand Types
| Type | Value |
|---|---|
| Numeric | [&] [== | > | >= | < | <= | !=] |
| Bitmask | [&] [= | ! | !=] |
Note: For the decimal type values (e.g., port), you can combine the
following operators and the reserved values. The following complies with
draft-ietf-idr-rfc5575.
| lt | gt | eq | Operator/Value |
|---|---|---|---|
| 0 | 0 | 0 | true (no operator and independent of the value) |
| 0 | 0 | 1 | == |
| 0 | 1 | 0 | > |
| 0 | 1 | 1 | >= |
| 1 | 0 | 0 | < |
| 1 | 0 | 1 | <= |
| 1 | 1 | 0 | != |
| 1 | 1 | 1 | false (no operator and independent of the value) |
Note: For the bitmask operand, RFC5575 says "=value" and "value" is the different in the bitwise match operation. With "=value", it is evaluated as "(data & value) == value"; with "value" (without "="), "data & value" evaluates to TRUE if any of the bits in the value mask are set in the data.
Example - Destination Prefix
| Key | Value |
|---|---|
| destination | IP Prefix (or IP Address) |
# gobgp global rib -a ipv4-flowspec add match destination <IPv4 Prefix> then <THEN>
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?}]
# If IPv4 address is specified, it will be treated as /32 prefix
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.1 then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.1/32] fictitious 00:00:00 [{Origin: ?}]
# gobgp global rib -a ipv6-flowspec add match destination <IPv6 Prefix> [OFFSET] then <THEN>
$ gobgp global rib -a ipv6-flowspec add match destination 2001:db8:1::/64 then accept
$ gobgp global rib -a ipv6-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 2001:db8:1::/64/0] fictitious 00:00:00 [{Origin: ?}]
# With prefix offset
$ gobgp global rib -a ipv6-flowspec add match destination 2001:db8:1::/64 32 then accept
$ gobgp global rib -a ipv6-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 2001:db8:1::/64/32] fictitious 00:00:00 [{Origin: ?}]
# As with IPv4 address, if IPv6 address is specified, it will be treated as /128 prefix
$ gobgp global rib -a ipv6-flowspec add match destination 2001:db8:1::1 then accept
$ gobgp global rib -a ipv6-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 2001:db8:1::1/128/0] fictitious 00:00:00 [{Origin: ?}]
Example - IP Protocol/Next Header
| Key | Operator | Value |
|---|---|---|
| protocol | [&] [== | > | >= | < | <= | !=] | Protocol name, decimal number, true or false. |
Supported Protocol Names: icmp, igmp, tcp, egp, igp, udp, rsvp,
gre, ospf, ipip, pim, sctp.
# gobgp global rib -a ipv4-flowspec add match protocol <Protocol> then <THEN>
$ gobgp global rib -a ipv4-flowspec add match protocol tcp then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [protocol: ==tcp] fictitious 00:00:00 [{Origin: ?}]
# Combination of rules
# Note: "true" or "false" should be the last of rule without operator
$ gobgp global rib -a ipv4-flowspec add match protocol '==tcp &=udp icmp >igmp >=egp <igp <=rsvp !=gre &!ospf true' then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [protocol: ==tcp&==udp ==icmp >igmp >=egp <igp <=rsvp !=gre&!=ospf true] fictitious 00:00:00 [{Origin: ?}]
Example - Port
| Key | Operator | Value |
|---|---|---|
| port | [&] [== | > | >= | < | <= | !=] | Decimal number, true or false |
# gobgp global rib -a ipv4-flowspec add match port <Port> then <THEN>
$ gobgp global rib -a ipv4-flowspec add match port 80 then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [port: ==80] fictitious 00:00:00 [{Origin: ?}]
# Combination of rules
# Note: "true" or "false" should be the last of rule without operator
$ gobgp global rib -a ipv4-flowspec add match port '==80 &=90 8080 >9090 >=10080 <10090 <=18080 !=19090 &!443 true' then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [port: ==80&==90 ==8080 >9090 >=10080 <10090 <=18080 !=19090&!=443 true] fictitious 00:00:00 [{Origin: ?}]
Example - TCP flags
| Key | Operand | Value |
|---|---|---|
| tcp-flags | [&] [= | ! | !=] | TCP flag or its combination. |
Supported TCP Flags: F (=FIN), S (=SYN), R (=RST), P (=PUSH),
A (=ACK), U (=URGENT), C (=CWR), E (=ECE).
# gobgp global rib -a ipv4-flowspec add match tcp-flags <TCP Flags> then <THEN>
$ gobgp global rib -a ipv4-flowspec add match tcp-flags SA then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [tcp-flags: SA] fictitious 00:00:00 [{Origin: ?}]
# Combination of rules
# Note: '=!C' will be converted to '!=C' for the backward compatibility
$ gobgp global rib -a ipv4-flowspec add match tcp-flags '==S &=SA A !F !=U =!C' then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [tcp-flags: =S&=SA A !F !=U !=C] fictitious 00:00:00 [{Origin: ?}]
Example - Fragment
| Key | Operand | Value |
|---|---|---|
| fragment | [&] [= | ! | !=] | Fragment type or its combination joined with +. |
Supported Fragment Types: not-a-fragment, dont-fragment, is-fragment,
first-fragment, last-fragment.
# gobgp global rib -a ipv4-flowspec add match fragment <Fragment> then <THEN>
$ gobgp global rib -a ipv4-flowspec add match fragment dont-fragment then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [fragment: dont-fragment] fictitious 00:00:00 [{Origin: ?}]
# Combination of rules
$ gobgp global rib -a ipv4-flowspec add match fragment dont-fragment is-fragment+first-fragment then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [fragment: dont-fragment is-fragment+first-fragment] fictitious 00:00:00 [{Origin: ?}]
Example - Ethernet Type
| Key | Operand | Value |
|---|---|---|
| ether-type | [&] [== | > | >= | < | <= | !=] | Ethernet type name, decimal number, true or false. |
Supported Ethernet Type Names: ipv4, arp, rarp, vmtp, apple-talk,
aarp, ipx, snmp, net-bios, xtp, ipv6, pppoe-discovery,
pppoe-session, loopback.
# gobgp global rib -a l2vpn-flowspec add rd <RD> match ether-type <Ethernet Type> then <THEN>
$ gobgp global rib -a l2vpn-flowspec add rd 65000:100 match ether-type arp then accept
$ gobgp global rib -a l2vpn-flowspec
Network Next Hop AS_PATH Age Attrs
*> [rd: 65000:100][ether-type: ==arp] fictitious 00:00:00 [{Origin: ?}]
Example - Source MAC
| Key | Value |
|---|---|
| source-mac | MAC Address. |
# gobgp global rib -a l2vpn-flowspec add rd <RD> match source-mac <MAC Address> then <THEN>
$ gobgp global rib -a l2vpn-flowspec add rd 65000:100 match source-mac aa:bb:cc:dd:ee:ff then accept
$ gobgp global rib -a l2vpn-flowspec
Network Next Hop AS_PATH Age Attrs
*> [rd: 65000:100][source-mac: aa:bb:cc:dd:ee:ff] fictitious 00:00:00 [{Origin: ?}]
Then (Traffic Filtering Actions)
| Type | Action | Description |
|---|---|---|
| - | accept | Accept the traffic. |
| 0x8006 | discard | Discard the traffic using traffic-rate of 0. |
| 0x8006 | rate-limit <RATE> [as <AS>] | Specify the rate of traffic in float value. |
| 0x8007 | action sample | Enables the traffic sampling and logging. |
| 0x8007 | action terminal | Specify the termination of the traffic filter. |
| 0x8007 | action sample-terminal | Specify both of sample and terminal. |
| 0x8008 | redirect <RT> | Redirect to VRF which has the given RT in its import policy. |
| 0x8009 | mark <VALUE> | Modifies the DSCP in IPv4 or Traffic Class in IPv6 with the given value. |
Example - accept/discard
# accept action
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then accept
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?}]
# discard action
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then discard
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [discard]}]
Example - rate-limit
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then rate-limit 100.0
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [rate: 100.000000]}]
# With the informational AS number
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then rate-limit 100.0 as 65000
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [rate: 100.000000(as: 65000)]}]
Example - action
# sample action
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then action sample
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [action: sample]}]
# terminal action
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then action terminal
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [action: terminal]}]
# sample-terminal action
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then action sample-terminal
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [action: terminal-sample]}]
Example - redirect
# with Two Octet AS specific RT
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then redirect 65000:100
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [redirect: 65000:100]}]
# with IPv4 address specific RT
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then redirect 1.1.1.1:100
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [redirect: 1.1.1.1:100]}]
# with IPv6 address specific RT
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then redirect 2001:db8::1:100
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [redirect: 2001:db8::1:100]}]
# with Four Octet AS specific RT
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then redirect 200.200:100
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [redirect: 200.200:100]}]
Example - mark
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 then mark 10
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [remark: 10]}]
Example of Combinations of Rules and Actions
# add a flowspec rule which redirect flows whose dst 10.0.0.0/24 and src 20.0.0.0/24 to VRF with RT 10:10
$ gobgp global rib -a ipv4-flowspec add match destination 10.0.0.0/24 source 20.0.0.0/24 then redirect 10:10
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 10.0.0.0/24][source: 20.0.0.0/24] fictitious 00:00:00 [{Origin: ?} {Extcomms: [redirect: 10:10]}]
# add a flowspec rule which discard flows whose dst 2001::2/128 and port equals 80 and with TCP flags not match SA (SYN/ACK) and not match U (URG)
$ gobgp global rib -a ipv6-flowspec add match destination 2001::2/128 port '==80' tcp-flags '!=SA&!=U' then discard
$ gobgp global rib -a ipv6-flowspec
Network Next Hop AS_PATH Age Attrs
*> [destination: 2001::2/128/0][port: ==80][tcp-flags: !=SA&!=U] fictitious 00:00:00 [{Origin: ?} {Extcomms: [discard]}]
# add another flowspec rule which discard flows whose
# - ip protocol is tcp
# - destination port is 80 or greater than or equal to 8080 and lesser than or equal to 8888
# - packet is a first fragment or a last fragment
$ gobgp global rib -a ipv4-flowspec add match protocol tcp destination-port '==80' '>=8080&<=8888' fragment '=first-fragment =last-fragment' then discard
$ gobgp global rib -a ipv4-flowspec
Network Next Hop AS_PATH Age Attrs
*> [protocol: ==tcp][destination-port: ==80 >=8080&<=8888][fragment: =first-fragment =last-fragment] fictitious 00:00:00 [{Origin: ?} {Extcomms: [discard]}]