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

Jun 04 15:43:41.555322 osdx systemd-journald[172397]: Runtime Journal (/run/log/journal/d7b8b58d13984d0bb9acdb87ea6c32f4) is 1.8M, max 13.8M, 11.9M free.
Jun 04 15:43:41.559012 osdx systemd-journald[172397]: Received client request to rotate journal, rotating.
Jun 04 15:43:41.559076 osdx systemd-journald[172397]: Vacuuming done, freed 0B of archived journals from /run/log/journal/d7b8b58d13984d0bb9acdb87ea6c32f4.
Jun 04 15:43:41.572610 osdx OSDxCLI[393060]: User 'admin' executed a new command: 'system journal clear'.
Jun 04 15:43:41.825984 osdx OSDxCLI[393060]: User 'admin' executed a new command: 'system coredump delete all'.
Jun 04 15:43:42.054438 osdx OSDxCLI[393060]: User 'admin' entered the configuration menu.
Jun 04 15:43:42.187041 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 192.168.100.10/24'.
Jun 04 15:43:42.289495 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-out LOG_NHRP'.
Jun 04 15:43:42.401834 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-in LOG_NHRP'.
Jun 04 15:43:42.505980 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 address 10.0.0.1/32'.
Jun 04 15:43:42.582391 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 encapsulation gre'.
Jun 04 15:43:42.729442 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 local-address 192.168.100.10'.
Jun 04 15:43:42.844900 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 nhrp'.
Jun 04 15:43:42.966295 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 log prefix NHRP__'.
Jun 04 15:43:43.069635 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 selector NHRP_SEL'.
Jun 04 15:43:43.137472 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'set traffic selector NHRP_SEL rule 1 ether-type 8193'.
Jun 04 15:43:43.282031 osdx OSDxCLI[393060]: User 'admin' added a new cfg line: 'show working'.
Jun 04 15:43:43.392281 osdx ubnt-cfgd[642501]: inactive
Jun 04 15:43:43.467366 osdx systemd[1]: Reloading frr.service - FRRouting...
Jun 04 15:43:43.482203 osdx watchfrr[642376]: [NG1AJ-FP2TQ] Terminating on signal
Jun 04 15:43:43.583367 osdx frrinit.sh[642531]: Stopped watchfrr.
Jun 04 15:43:43.584612 osdx frrinit.sh[642531]: 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'.
Jun 04 15:43:43.594215 osdx watchfrr[642549]: [T83RR-8SM5G] watchfrr 10.4.1 starting: vty@0
Jun 04 15:43:43.594265 osdx watchfrr[642549]: [QDG3Y-BY5TN] zebra state -> up : connect succeeded
Jun 04 15:43:43.594289 osdx watchfrr[642549]: [QDG3Y-BY5TN] mgmtd state -> up : connect succeeded
Jun 04 15:43:43.594317 osdx watchfrr[642549]: [ZCJ3S-SPH5S] nhrpd state -> down : initial connection attempt failed
Jun 04 15:43:43.594320 osdx watchfrr[642549]: [QDG3Y-BY5TN] staticd state -> up : connect succeeded
Jun 04 15:43:43.594469 osdx watchfrr[642549]: [YFT0P-5Q5YX] Forked background command [pid 642550]: /usr/lib/frr/watchfrr.sh restart nhrpd
Jun 04 15:43:43.599078 osdx frrinit.sh[642550]: Cannot stop nhrpd: pid file not found
Jun 04 15:43:43.600019 osdx watchfrr.sh[642555]: Cannot stop nhrpd: pid file not found
Jun 04 15:43:43.612039 osdx zebra[527322]: [V98V0-MTWPF] client 36 says hello and bids fair to announce only nhrp routes vrf=0
Jun 04 15:43:43.621083 osdx frrinit.sh[642560]: sh: line 1: ipsec: command not found
Jun 04 15:43:43.633412 osdx nhrpd[642557]: [W9E3X-A5P3X] nhrpd: set-config-loaded received, marking as loaded
Jun 04 15:43:43.634519 osdx watchfrr[642549]: [QDG3Y-BY5TN] nhrpd state -> up : connect succeeded
Jun 04 15:43:43.634526 osdx watchfrr[642549]: [KWE5Q-QNGFC] all daemons up, doing startup-complete notify
Jun 04 15:43:43.634996 osdx frrinit.sh[642531]: Started watchfrr.
Jun 04 15:43:43.737252 osdx systemd[1]: Reloaded frr.service - FRRouting.
Jun 04 15:43:43.766959 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0
Jun 04 15:43:43.811371 osdx WARNING[642654]: No supported link modes on interface eth0
Jun 04 15:43:43.813092 osdx modulelauncher[642654]: osdx.utils.xos cmd error: /sbin/ethtool -A eth0 autoneg on
Jun 04 15:43:43.813105 osdx modulelauncher[642654]: Command '/sbin/ethtool -A eth0 autoneg on' returned non-zero exit status 76.
Jun 04 15:43:43.814520 osdx modulelauncher[642654]: osdx.utils.xos cmd error: /sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --
Jun 04 15:43:43.814529 osdx modulelauncher[642654]: Command '/sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --' returned non-zero exit status 75.
Jun 04 15:43:43.836956 osdx (udev-worker)[642682]: Network interface NamePolicy= disabled on kernel command line.
Jun 04 15:43:44.069448 osdx cfgd[1850]: [393060]Completed change to active configuration
Jun 04 15:43:44.084194 osdx OSDxCLI[393060]: User 'admin' committed the configuration.
Jun 04 15:43:44.106385 osdx OSDxCLI[393060]: User 'admin' left the configuration menu.
Jun 04 15:43:45.828916 osdx OSDxCLI[393060]: User 'admin' executed a new command: 'protocols ip show nhrp'.
Jun 04 15:43:46.681858 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:a4:dc:40:00:40:2f:4c:0f:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
Jun 04 15:43:46.681942 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
Jun 04 15:43:46.681955 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
Jun 04 15:43:47.682278 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:a4:f1:40:00:40:2f:4b:fa:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
Jun 04 15:43:47.682958 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
Jun 04 15:43:47.682974 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
Jun 04 15:43:47.897302 osdx OSDxCLI[393060]: 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*