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 the command protocols ip show nhrp on DUT0 and check whether the output matches the following regular expressions:

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

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

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

Show output

May 19 21:59:48.277089 osdx systemd-journald[2151]: Runtime Journal (/run/log/journal/7cdaf5f7d8fb4b48a1b90dc93e5f0def) is 1.9M, max 13.8M, 11.9M free.
May 19 21:59:48.278542 osdx systemd-journald[2151]: Received client request to rotate journal, rotating.
May 19 21:59:48.278599 osdx systemd-journald[2151]: Vacuuming done, freed 0B of archived journals from /run/log/journal/7cdaf5f7d8fb4b48a1b90dc93e5f0def.
May 19 21:59:48.286060 osdx OSDxCLI[103550]: User 'admin' executed a new command: 'system journal clear'.
May 19 21:59:48.484444 osdx OSDxCLI[103550]: User 'admin' executed a new command: 'system coredump delete all'.
May 19 21:59:48.704706 osdx OSDxCLI[103550]: User 'admin' entered the configuration menu.
May 19 21:59:48.828785 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 192.168.100.10/24'.
May 19 21:59:48.892944 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-out LOG_NHRP'.
May 19 21:59:48.982062 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-in LOG_NHRP'.
May 19 21:59:49.032343 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 address 10.0.0.1/32'.
May 19 21:59:49.124992 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 encapsulation gre'.
May 19 21:59:49.177541 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 local-address 192.168.100.10'.
May 19 21:59:49.269144 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 nhrp'.
May 19 21:59:49.322847 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 log prefix NHRP__'.
May 19 21:59:49.416791 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 selector NHRP_SEL'.
May 19 21:59:49.476379 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'set traffic selector NHRP_SEL rule 1 ether-type 8193'.
May 19 21:59:49.579784 osdx OSDxCLI[103550]: User 'admin' added a new cfg line: 'show working'.
May 19 21:59:49.638585 osdx ubnt-cfgd[202468]: inactive
May 19 21:59:49.706967 osdx systemd[1]: Reloading frr.service - FRRouting...
May 19 21:59:49.726943 osdx watchfrr[202317]: [NG1AJ-FP2TQ] Terminating on signal
May 19 21:59:49.827722 osdx frrinit.sh[202501]: Stopped watchfrr.
May 19 21:59:49.828553 osdx frrinit.sh[202501]: Starting watchfrr with command: '  /usr/lib/frr/watchfrr  -d  --min-restart-interval 1 --max-restart-interval 600 --timeout 600 --restart-timeout 600 mgmtd zebra nhrpd staticd'.
May 19 21:59:49.836372 osdx watchfrr[202519]: [T83RR-8SM5G] watchfrr 10.6.0 starting: vty@0
May 19 21:59:49.836437 osdx watchfrr[202519]: [QDG3Y-BY5TN] mgmtd state -> up : connect succeeded
May 19 21:59:49.836473 osdx watchfrr[202519]: [QDG3Y-BY5TN] zebra state -> up : connect succeeded
May 19 21:59:49.836517 osdx watchfrr[202519]: [ZCJ3S-SPH5S] nhrpd state -> down : initial connection attempt failed
May 19 21:59:49.836521 osdx watchfrr[202519]: [QDG3Y-BY5TN] staticd state -> up : connect succeeded
May 19 21:59:49.836693 osdx watchfrr[202519]: [YFT0P-5Q5YX] Forked background command [pid 202520]: /usr/lib/frr/watchfrr.sh restart nhrpd
May 19 21:59:49.842301 osdx frrinit.sh[202520]: Cannot stop nhrpd: pid file not found
May 19 21:59:49.843503 osdx watchfrr.sh[202525]: Cannot stop nhrpd: pid file not found
May 19 21:59:49.860406 osdx zebra[1839]: [V98V0-MTWPF] client 41 says hello and bids fair to announce only nhrp routes vrf=0
May 19 21:59:49.869910 osdx frrinit.sh[202530]: sh: line 1: ipsec: command not found
May 19 21:59:49.879628 osdx nhrpd[202527]: [W9E3X-A5P3X] nhrpd: set-config-loaded received, marking as loaded
May 19 21:59:49.880379 osdx watchfrr[202519]: [QDG3Y-BY5TN] nhrpd state -> up : connect succeeded
May 19 21:59:49.880387 osdx watchfrr[202519]: [KWE5Q-QNGFC] all daemons up, doing startup-complete notify
May 19 21:59:49.880817 osdx frrinit.sh[202501]: Started watchfrr.
May 19 21:59:49.969101 osdx systemd[1]: Reloaded frr.service - FRRouting.
May 19 21:59:49.998545 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0
May 19 21:59:50.041026 osdx WARNING[202626]: No supported link modes on interface eth0
May 19 21:59:50.042668 osdx modulelauncher[202626]: osdx.utils.xos cmd error: /sbin/ethtool -A eth0 autoneg on
May 19 21:59:50.042679 osdx modulelauncher[202626]: Command '/sbin/ethtool -A eth0 autoneg on' returned non-zero exit status 76.
May 19 21:59:50.043744 osdx modulelauncher[202626]: osdx.utils.xos cmd error: /sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --
May 19 21:59:50.043751 osdx modulelauncher[202626]: Command '/sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --' returned non-zero exit status 75.
May 19 21:59:50.060847 osdx (udev-worker)[202649]: Network interface NamePolicy= disabled on kernel command line.
May 19 21:59:50.470425 osdx cfgd[1899]: [103550]Completed change to active configuration
May 19 21:59:50.510058 osdx OSDxCLI[103550]: User 'admin' committed the configuration.
May 19 21:59:50.533393 osdx OSDxCLI[103550]: User 'admin' left the configuration menu.
May 19 21:59:52.010813 osdx OSDxCLI[103550]: User 'admin' executed a new command: 'protocols ip show nhrp'.
May 19 21:59:52.775530 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:06:e2:40:00:40:2f:ea:09:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
May 19 21:59:52.778539 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
May 19 21:59:52.778558 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
May 19 21:59:53.776472 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:07:51:40:00:40:2f:e9:9a:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
May 19 21:59:53.778537 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
May 19 21:59:53.778552 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
May 19 21:59:54.074696 osdx OSDxCLI[103550]: User 'admin' executed a new command: 'protocols ip show nhrp'.

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

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