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Check Link Hook

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

../../../../../_images/topology25.svg

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
Show output
Iface      Type     Protocol         NBMA             Claimed NBMA     Expires(s)   Flags  Identity
tun0       local    10.0.0.1         192.168.100.10   192.168.100.10   -                   -
tun0       dynamic  10.0.0.2         192.168.100.20   192.168.100.20   5            UT

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
Nov 12 12:33:00.293161 osdx systemd-journald[1959]: Runtime Journal (/run/log/journal/5e4ed8d3546348e58126c9438c4a827c) is 1.8M, max 13.8M, 11.9M free.
Nov 12 12:33:00.295358 osdx systemd-journald[1959]: Received client request to rotate journal, rotating.
Nov 12 12:33:00.295414 osdx systemd-journald[1959]: Vacuuming done, freed 0B of archived journals from /run/log/journal/5e4ed8d3546348e58126c9438c4a827c.
Nov 12 12:33:00.303065 osdx OSDxCLI[145160]: User 'admin' executed a new command: 'system journal clear'.
Nov 12 12:33:00.507594 osdx OSDxCLI[145160]: User 'admin' executed a new command: 'system coredump delete all'.
Nov 12 12:33:00.732832 osdx OSDxCLI[145160]: User 'admin' entered the configuration menu.
Nov 12 12:33:00.821996 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 192.168.100.10/24'.
Nov 12 12:33:00.914907 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-out LOG_NHRP'.
Nov 12 12:33:01.024266 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-in LOG_NHRP'.
Nov 12 12:33:01.089658 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 address 10.0.0.1/32'.
Nov 12 12:33:01.195681 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 encapsulation gre'.
Nov 12 12:33:01.251604 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 local-address 192.168.100.10'.
Nov 12 12:33:01.345869 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 nhrp'.
Nov 12 12:33:01.402412 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 log prefix NHRP__'.
Nov 12 12:33:01.494138 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 selector NHRP_SEL'.
Nov 12 12:33:01.583803 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'set traffic selector NHRP_SEL rule 1 ether-type 8193'.
Nov 12 12:33:01.671697 osdx OSDxCLI[145160]: User 'admin' added a new cfg line: 'show working'.
Nov 12 12:33:01.799046 osdx ubnt-cfgd[156670]: inactive
Nov 12 12:33:01.867634 osdx systemd[1]: Reloading frr.service - FRRouting...
Nov 12 12:33:01.884607 osdx watchfrr[114271]: [NG1AJ-FP2TQ] Terminating on signal
Nov 12 12:33:01.985576 osdx frrinit.sh[156700]: Stopped watchfrr.
Nov 12 12:33:01.986436 osdx frrinit.sh[156700]: 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'.
Nov 12 12:33:01.992943 osdx watchfrr[156718]: [T83RR-8SM5G] watchfrr 10.4.1 starting: vty@0
Nov 12 12:33:01.992981 osdx watchfrr[156718]: [QDG3Y-BY5TN] zebra state -> up : connect succeeded
Nov 12 12:33:01.992998 osdx watchfrr[156718]: [QDG3Y-BY5TN] mgmtd state -> up : connect succeeded
Nov 12 12:33:01.993058 osdx watchfrr[156718]: [ZCJ3S-SPH5S] nhrpd state -> down : initial connection attempt failed
Nov 12 12:33:01.993060 osdx watchfrr[156718]: [QDG3Y-BY5TN] staticd state -> up : connect succeeded
Nov 12 12:33:01.993227 osdx watchfrr[156718]: [YFT0P-5Q5YX] Forked background command [pid 156719]: /usr/lib/frr/watchfrr.sh restart nhrpd
Nov 12 12:33:01.996982 osdx frrinit.sh[156719]: Cannot stop nhrpd: pid file not found
Nov 12 12:33:01.997845 osdx watchfrr.sh[156724]: Cannot stop nhrpd: pid file not found
Nov 12 12:33:02.012114 osdx zebra[20982]: [V98V0-MTWPF] client 36 says hello and bids fair to announce only nhrp routes vrf=0
Nov 12 12:33:02.020947 osdx frrinit.sh[156729]: sh: line 1: ipsec: command not found
Nov 12 12:33:02.021780 osdx watchfrr[156718]: [QDG3Y-BY5TN] nhrpd state -> up : connect succeeded
Nov 12 12:33:02.021786 osdx watchfrr[156718]: [KWE5Q-QNGFC] all daemons up, doing startup-complete notify
Nov 12 12:33:02.022199 osdx frrinit.sh[156700]: Started watchfrr.
Nov 12 12:33:02.120176 osdx systemd[1]: Reloaded frr.service - FRRouting.
Nov 12 12:33:02.143367 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0
Nov 12 12:33:02.192500 osdx WARNING[156821]: No supported link modes on interface eth0
Nov 12 12:33:02.193857 osdx modulelauncher[156821]: osdx.utils.xos cmd error: /sbin/ethtool -A eth0 autoneg on
Nov 12 12:33:02.193871 osdx modulelauncher[156821]: Command '/sbin/ethtool -A eth0 autoneg on' returned non-zero exit status 76.
Nov 12 12:33:02.195030 osdx modulelauncher[156821]: osdx.utils.xos cmd error: /sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --
Nov 12 12:33:02.195037 osdx modulelauncher[156821]: Command '/sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --' returned non-zero exit status 75.
Nov 12 12:33:02.215460 osdx (udev-worker)[156849]: Network interface NamePolicy= disabled on kernel command line.
Nov 12 12:33:02.476142 osdx cfgd[1656]: [145160]Completed change to active configuration
Nov 12 12:33:02.486747 osdx OSDxCLI[145160]: User 'admin' committed the configuration.
Nov 12 12:33:02.514825 osdx OSDxCLI[145160]: User 'admin' left the configuration menu.
Nov 12 12:33:03.952965 osdx OSDxCLI[145160]: User 'admin' executed a new command: 'protocols ip show nhrp'.
Nov 12 12:33:04.835372 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:f1:58:40:00:40:2f:ff:92:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
Nov 12 12:33:04.835460 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
Nov 12 12:33:04.835476 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
Nov 12 12:33:05.831986 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:f1:7a:40:00:40:2f:ff:70:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
Nov 12 12:33:05.832074 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
Nov 12 12:33:05.832086 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
Nov 12 12:33:06.043379 osdx OSDxCLI[145160]: 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*
Show output
Policy LOG_NHRP -- ifc tun0 -- hook link-in prio very-high

---------------------------------------------------------------
rule   selector  pkts match  pkts eval  bytes match  bytes eval
---------------------------------------------------------------
1      NHRP_SEL           4          4          456         456
---------------------------------------------------------------
Total                     4          4          456         456

Policy LOG_NHRP -- ifc tun0 -- hook link-out prio very-high

---------------------------------------------------------------
rule   selector  pkts match  pkts eval  bytes match  bytes eval
---------------------------------------------------------------
1      NHRP_SEL           2          2          272         272
---------------------------------------------------------------
Total                     2          2          272         272
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