Check Link Hook

This example demonstrates how to process outgoing NHRP traffic in a scenario using one Tunnel with GRE encapsulation.

Test Marks In NHRP Traffic

Description

In this scenario, a traffic policy was configured to log outgoing NHRP traffic, which is non-IP Layer 3 protocol. The special hook link-out can be used to process these outgoing frames.

Scenario

Step 1: Set the following configuration in DUT0 :

set interfaces ethernet eth0 address 192.168.100.10/24
set interfaces tunnel tun0 address 10.0.0.1/32
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-address 192.168.100.10
set interfaces tunnel tun0 nhrp
set interfaces tunnel tun0 traffic policy link-in LOG_NHRP
set interfaces tunnel tun0 traffic policy link-out LOG_NHRP
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
set traffic policy LOG_NHRP rule 1 log prefix NHRP__
set traffic policy LOG_NHRP rule 1 selector NHRP_SEL
set traffic selector NHRP_SEL rule 1 ether-type 8193

Note

NHRP packets use ethertype 8193 (0x2001).

Step 2: Set the following configuration in DUT1 :

set interfaces ethernet eth0 address 192.168.100.20/24
set interfaces tunnel tun0 address 10.0.0.2/32
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-address 192.168.100.20
set interfaces tunnel tun0 nhrp holdtime 5
set interfaces tunnel tun0 nhrp nhs 10.0.0.1 nbma 192.168.100.10
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Run command protocols ip show nhrp at DUT0 and check if output matches the following regular expressions:

tun0\s+dynamic\s+10\.0\.0\.2

Step 4: Run command system journal show | cat at DUT0 and check if output matches the following regular expressions:

\[NHRP__-1\] ACCEPT IN=tun0 OUT=\w+
\[NHRP__-1\] ACCEPT IN= OUT=tun0

Show output

Dec 11 14:45:15.323619 osdx systemd-journald[1970]: Runtime Journal (/run/log/journal/ff8de1b7feed4cd0a923a6e53f75b1b9) is 1.7M, max 13.8M, 12.0M free.
Dec 11 14:45:15.325575 osdx systemd-journald[1970]: Received client request to rotate journal, rotating.
Dec 11 14:45:15.325648 osdx systemd-journald[1970]: Vacuuming done, freed 0B of archived journals from /run/log/journal/ff8de1b7feed4cd0a923a6e53f75b1b9.
Dec 11 14:45:15.333337 osdx OSDxCLI[48660]: User 'admin' executed a new command: 'system journal clear'.
Dec 11 14:45:15.569955 osdx OSDxCLI[48660]: User 'admin' executed a new command: 'system coredump delete all'.
Dec 11 14:45:15.852144 osdx OSDxCLI[48660]: User 'admin' entered the configuration menu.
Dec 11 14:45:15.994441 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 192.168.100.10/24'.
Dec 11 14:45:16.069577 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-out LOG_NHRP'.
Dec 11 14:45:16.138398 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-in LOG_NHRP'.
Dec 11 14:45:16.255541 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 address 10.0.0.1/32'.
Dec 11 14:45:16.386318 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 encapsulation gre'.
Dec 11 14:45:16.461931 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 local-address 192.168.100.10'.
Dec 11 14:45:16.566657 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 nhrp'.
Dec 11 14:45:16.632290 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 log prefix NHRP__'.
Dec 11 14:45:16.736452 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 selector NHRP_SEL'.
Dec 11 14:45:16.803215 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'set traffic selector NHRP_SEL rule 1 ether-type 8193'.
Dec 11 14:45:16.917744 osdx OSDxCLI[48660]: User 'admin' added a new cfg line: 'show working'.
Dec 11 14:45:16.980074 osdx ubnt-cfgd[87179]: inactive
Dec 11 14:45:17.057853 osdx systemd[1]: Reloading frr.service - FRRouting...
Dec 11 14:45:17.071726 osdx watchfrr[16058]: [NG1AJ-FP2TQ] Terminating on signal
Dec 11 14:45:17.172830 osdx frrinit.sh[87209]: Stopped watchfrr.
Dec 11 14:45:17.173736 osdx frrinit.sh[87209]: Starting watchfrr with command: '  /usr/lib/frr/watchfrr  -d  --min-restart-interval 1 --max-restart-interval 600 --timeout 600 --restart-timeout 600 zebra mgmtd nhrpd staticd'.
Dec 11 14:45:17.180249 osdx watchfrr[87227]: [T83RR-8SM5G] watchfrr 10.4.1 starting: vty@0
Dec 11 14:45:17.180300 osdx watchfrr[87227]: [QDG3Y-BY5TN] zebra state -> up : connect succeeded
Dec 11 14:45:17.180328 osdx watchfrr[87227]: [QDG3Y-BY5TN] mgmtd state -> up : connect succeeded
Dec 11 14:45:17.180358 osdx watchfrr[87227]: [ZCJ3S-SPH5S] nhrpd state -> down : initial connection attempt failed
Dec 11 14:45:17.180361 osdx watchfrr[87227]: [QDG3Y-BY5TN] staticd state -> up : connect succeeded
Dec 11 14:45:17.180826 osdx watchfrr[87227]: [YFT0P-5Q5YX] Forked background command [pid 87228]: /usr/lib/frr/watchfrr.sh restart nhrpd
Dec 11 14:45:17.185033 osdx frrinit.sh[87228]: Cannot stop nhrpd: pid file not found
Dec 11 14:45:17.185905 osdx watchfrr.sh[87233]: Cannot stop nhrpd: pid file not found
Dec 11 14:45:17.195258 osdx zebra[1587]: [V98V0-MTWPF] client 36 says hello and bids fair to announce only nhrp routes vrf=0
Dec 11 14:45:17.203945 osdx watchfrr[87227]: [QDG3Y-BY5TN] nhrpd state -> up : connect succeeded
Dec 11 14:45:17.203950 osdx watchfrr[87227]: [KWE5Q-QNGFC] all daemons up, doing startup-complete notify
Dec 11 14:45:17.204656 osdx frrinit.sh[87209]: Started watchfrr
Dec 11 14:45:17.204656 osdx frrinit.sh[87238]: sh: line 1: ipsec: command not found
Dec 11 14:45:17.204779 osdx frrinit.sh[87209]: .
Dec 11 14:45:17.298005 osdx systemd[1]: Reloaded frr.service - FRRouting.
Dec 11 14:45:17.341566 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0
Dec 11 14:45:17.382560 osdx WARNING[87331]: No supported link modes on interface eth0
Dec 11 14:45:17.384260 osdx modulelauncher[87331]: osdx.utils.xos cmd error: /sbin/ethtool -A eth0 autoneg on
Dec 11 14:45:17.384274 osdx modulelauncher[87331]: Command '/sbin/ethtool -A eth0 autoneg on' returned non-zero exit status 76.
Dec 11 14:45:17.385858 osdx modulelauncher[87331]: osdx.utils.xos cmd error: /sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --
Dec 11 14:45:17.385870 osdx modulelauncher[87331]: Command '/sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --' returned non-zero exit status 75.
Dec 11 14:45:17.408562 osdx (udev-worker)[87359]: Network interface NamePolicy= disabled on kernel command line.
Dec 11 14:45:17.874729 osdx cfgd[1647]: [48660]Completed change to active configuration
Dec 11 14:45:17.886242 osdx OSDxCLI[48660]: User 'admin' committed the configuration.
Dec 11 14:45:17.901668 osdx OSDxCLI[48660]: User 'admin' left the configuration menu.
Dec 11 14:45:19.656741 osdx OSDxCLI[48660]: User 'admin' executed a new command: 'protocols ip show nhrp'.
Dec 11 14:45:20.516396 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:d2:4b:40:00:40:2f:1e:a0:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
Dec 11 14:45:20.516497 osdx kernel: [NHRP__-1] ACCEPT IN= OUT=tun0 MAC=45:01:00:00:00:00:40:00:40:2f:00:00:c0:a8:64:0a:c0:a8:64:14:00:00:20:01
Dec 11 14:45:20.516511 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT=eth0 MAC=00:01:08:00:00:00:00:00:00:40:00:70:2b:43:00:34:01:04:04:00:04:04:00:02
Dec 11 14:45:21.516926 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:d2:ce:40:00:40:2f:1e:1d:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
Dec 11 14:45:21.517003 osdx kernel: [NHRP__-1] ACCEPT IN= OUT=tun0 MAC=45:01:00:00:00:00:40:00:40:2f:00:00:c0:a8:64:0a:c0:a8:64:14:00:00:20:01
Dec 11 14:45:21.517013 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT=eth0 MAC=00:01:08:00:00:00:00:00:00:40:00:70:2b:42:00:34:01:04:04:00:04:04:00:02
Dec 11 14:45:21.741294 osdx OSDxCLI[48660]: User 'admin' executed a new command: 'protocols ip show nhrp'.

Step 5: Run command traffic policy show at DUT0 and check if output matches the following regular expressions:

1\s+NHRP_SEL\s+\b[^0]\d*