SHARP

SHARP is a daemon that provides miscellaneous functionality used for testing FRR and creating proof-of-concept labs.

Starting SHARP

Default configuration file for sharpd is sharpd.conf. The typical location of sharpd.conf is /etc/frr/sharpd.conf.

If the user is using integrated config, then sharpd.conf need not be present and the frr.conf is read instead.

SHARP supports all the common FRR daemon start options which are documented elsewhere.

Using SHARP

All sharp commands are under the enable node and preceded by the sharp keyword. At present, no sharp commands will be preserved in the config.

sharp install routes A.B.C.D <nexthop <E.F.G.H|X:X::X:X>|nexthop-group NAME> (1-1000000) [instance (0-255)] [repeat (2-1000)] [opaque WORD]

Install up to 1,000,000 (one million) /32 routes starting at A.B.C.D with specified nexthop E.F.G.H or X:X::X:X. The nexthop is a NEXTHOP_TYPE_IPV4 or NEXTHOP_TYPE_IPV6 and must be reachable to be installed into the kernel. Alternatively a nexthop-group NAME can be specified and used as the nexthops. The routes are installed into zebra as ZEBRA_ROUTE_SHARP and can be used as part of a normal route redistribution. Route installation time is noted in the debug log. When zebra successfully installs a route into the kernel and SHARP receives success notifications for all routes this is logged as well. Instance (0-255) if specified causes the routes to be installed in a different instance. If repeat is used then we will install/uninstall the routes the number of times specified. If the keyword opaque is specified then the next word is sent down to zebra as part of the route installation.

sharp remove routes A.B.C.D (1-1000000)

Remove up to 1,000,000 (one million) /32 routes starting at A.B.C.D. The routes are removed from zebra. Route deletion start is noted in the debug log and when all routes have been successfully deleted the debug log will be updated with this information as well.

sharp data route

Allow end user doing route install and deletion to get timing information from the vty or vtysh instead of having to read the log file. This command is informational only and you should look at sharp_vty.c for explanation of the output as that it may change.

sharp label <ipv4|ipv6> vrf NAME label (0-1000000)

Install a label into the kernel that causes the specified vrf NAME table to be used for pop and forward operations when the specified label is seen.

sharp watch <nexthop <A.B.C.D|X:X::X:X>|import <A.B.C.D/M:X:X::X:X/M> [connected]

Instruct zebra to monitor and notify sharp when the specified nexthop is changed. The notification from zebra is written into the debug log. The nexthop or import choice chooses the type of nexthop we are asking zebra to watch for us. This choice affects zebra's decision on what matches. Connected tells zebra whether or not that we want the route matched against to be a static or connected route for the nexthop keyword, for the import keyword connected means exact match. The no form of the command obviously turns this watching off.

sharp data nexthop

Allow end user to dump associated data with the nexthop tracking that may have been turned on.

sharp watch [vrf NAME] redistribute ROUTETYPE

Allow end user to monitor redistributed routes of ROUTETYPE origin.

sharp lsp [update] (0-100000) nexthop-group NAME [prefix A.B.C.D/M TYPE [instance (0-255)]]

Install an LSP using the specified in-label, with nexthops as listed in nexthop-group NAME. If update is included, the update path is used. The LSP is installed as type ZEBRA_LSP_SHARP. If prefix is specified, an existing route with type TYPE (and optional instance id) will be updated to use the LSP.

sharp remove lsp (0-100000) nexthop-group NAME [prefix A.B.C.D/M TYPE [instance (0-255)]]

Remove a SHARPD LSP that uses the specified in-label, where the nexthops are specified in nexthop-group NAME. If prefix is specified, remove label bindings from the route of type TYPE also.

sharp send opaque type (1-255) (1-1000)

Send opaque ZAPI messages with subtype type. Sharpd will send a stream of messages if the count is greater than one.

sharp send opaque unicast type (1-255) PROTOCOL [{instance (0-1000) | session (1-1000)}] (1-1000)

Send unicast opaque ZAPI messages with subtype type. The protocol, instance, and session_id identify a single target zapi client. Sharpd will send a stream of messages if the count is greater than one.

sharp send opaque <reg | unreg> PROTOCOL [{instance (0-1000) | session (1-1000)}] type (1-1000)

Send opaque ZAPI registration and unregistration messages for a single subtype. The messages must specify a protocol daemon by name, and can include optional zapi instance and session values.

sharp create session (1-1024)

Create an additional zapi client session for testing, using the specified session id.

sharp remove session (1-1024)

Remove a test zapi client session that was created with the specified session id.

sharp neigh discover [vrf NAME] <A.B.C.D|X:X::X:X> IFNAME

Send an ARP/NDP request to trigger the addition of a neighbor in the ARP table.

sharp import-te

Import Traffic Engineering Database produce by OSPF or IS-IS.

show sharp ted [verbose|json]

show sharp ted [<vertex [A.B.C.D]|edge [A.B.C.D]|subnet [A.B.C.D/M]>] [verbose|json]

Show imported Traffic Engineering Data Base

sharp install seg6-routes [vrf NAME] <A.B.C.D|X:X::X:X> nexthop-seg6 X:X::X:X encap X:X::X:X (1-1000000)

This command installs a route for SRv6 Transit behavior (on Linux it is known as seg6 route). The count, destination, vrf, etc. have the same meaning as in the sharp install routes command. With this command, sharpd will request zebra to configure seg6 route via ZEBRA_ROUTE_ADD ZAPI. As in the following example.

router# sharp install seg6-routes 1::A nexthop-seg6 2001::2 encap A:: 1
router# sharp install seg6-routes 1::B nexthop-seg6 2001::2 encap B:: 1

router# show ipv6 route
D>* 1::A/128 [150/0] via 2001::2, dum0, seg6 a::, weight 1, 00:00:01
D>* 1::B/128 [150/0] via 2001::2, dum0, seg6 b::, weight 1, 00:00:01

bash# ip -6 route list
1::A  encap seg6 mode encap segs 1 [ a:: ] via 2001::2 dev dum0 proto 194 metric 20 pref medium
1::B  encap seg6 mode encap segs 1 [ b:: ] via 2001::2 dev dum0 proto 194 metric 20 pref medium

sharp install seg6local-routes [vrf NAME] X:X::X:X nexthop-seg6local NAME ACTION ARGS.. (1-1000000)

This command installs a route for SRv6 Endpoint behavior (on Linux it is known as seg6local route). The count, destination, vrf, etc. have the same meaning as in the sharp install routes command. With this command, sharpd will request zebra to configure seg6local route via ZEBRA_ROUTE_ADD ZAPI. As in the following example.

There are many End Functions defined in SRv6, which have been standardized in RFC 8986. The current implementation supports End, End.X, End.T, End.DX4, and End.DT6, which can be configured as follows.

router# sharp install seg6local-routes 1::1 nexthop-seg6local dum0 End 1
router# sharp install seg6local-routes 1::2 nexthop-seg6local dum0 End_X 2001::1 1
router# sharp install seg6local-routes 1::3 nexthop-seg6local dum0 End_T 10 1
router# sharp install seg6local-routes 1::4 nexthop-seg6local dum0 End_DX4 10.0.0.1 1
router# sharp install seg6local-routes 1::5 nexthop-seg6local dum0 End_DT6 10 1

router# show ipv6 route
D>* 1::1/128 [150/0] is directly connected, dum0, seg6local End USP, weight 1, 00:00:05
D>* 1::2/128 [150/0] is directly connected, dum0, seg6local End.X nh6 2001::1, weight 1, 00:00:05
D>* 1::3/128 [150/0] is directly connected, dum0, seg6local End.T table 10, weight 1, 00:00:05
D>* 1::4/128 [150/0] is directly connected, dum0, seg6local End.DX4 nh4 10.0.0.1, weight 1, 00:00:05
D>* 1::5/128 [150/0] is directly connected, dum0, seg6local End.DT6 table 10, weight 1, 00:00:05

bash# ip -6 route
1::1  encap seg6local action End dev dum0 proto 194 metric 20 pref medium
1::2  encap seg6local action End.X nh6 2001::1 dev dum0 proto 194 metric 20 pref medium
1::3  encap seg6local action End.T table 10 dev dum0 proto 194 metric 20 pref medium
1::4  encap seg6local action End.DX4 nh4 10.0.0.1 dev dum0 proto 194 metric 20 pref medium
1::5  encap seg6local action End.DT6 table 10 dev dum0 proto 194 metric 20 pref medium

show sharp segment-routing srv6

This command shows us what SRv6 locator chunk, sharp is holding as zclient. An SRv6 locator is defined for each SRv6 router, and a single locator may be shared by multiple protocols.

In the FRRouting implementation, the Locator chunk get request is executed by a routing protocol daemon such as sharpd or bgpd, And then Zebra allocates a Locator Chunk, which is a subset of the Locator Prefix, and notifies the requesting protocol daemon of this information.

This command example shows how the locator chunk of sharpd itself is allocated.

router# show segment-routing srv6 locator
Locator:
Name                 ID            2 2001:db8:2:2::/64        Up

router# show sharp segment-routing srv6
Locator loc1 has 1 prefix chunks
  2001:db8:1:1::/64

sharp srv6-manager get-locator-chunk

This command requests the SRv6 locator to allocate a locator chunk via ZAPI. This chunk can be owned by the protocol daemon, and the chunk obtained by sharpd will not be used by the SRv6 mechanism of another routing protocol.

Since this request is made asynchronously, it can be issued before the SRv6 locator is configured on the zebra side, and as soon as it is ready on the zebra side, sharpd can check the allocated locator chunk via zapi.

router# show segment-routing srv6 locator loc1 detail
Name: loc1
Prefix: 2001:db8:1:1::/64
Chunks:
- prefix: 2001:db8:1:1::/64, owner: system

router# show sharp segment-routing srv6
(nothing)

router# sharp srv6-manager get-locator-chunk loc1

router# show segment-routing srv6 locator loc1 detail
Name: loc1
Prefix: 2001:db8:1:1::/64
Chunks:
- prefix: 2001:db8:1:1::/64, owner: sharp

router# show sharp segment-routing srv6
Locator loc1 has 1 prefix chunks
  2001:db8:1:1::/64

sharp srv6-manager release-locator-chunk

This command releases a locator chunk that has already been allocated by ZAPI. The freed chunk will have its owner returned to the system and will be available to another protocol daemon.

router# show segment-routing srv6 locator loc1 detail
Name: loc1
Prefix: 2001:db8:1:1::/64
Chunks:
- prefix: 2001:db8:1:1::/64, owner: sharp

router# show sharp segment-routing srv6
Locator loc1 has 1 prefix chunks
  2001:db8:1:1::/64

router# sharp srv6-manager release-locator-chunk loc1

router# show segment-routing srv6 locator loc1 detail
Name: loc1
Prefix: 2001:db8:1:1::/64
Chunks:
- prefix: 2001:db8:1:1::/64, owner: system

router# show sharp segment-routing srv6
(nothing)