Extract routing information from cisco router

smithjnick — Tue, 29 Sep 2020 21:57:42 GMT

Hi folks, i hope somebody can help me.

I have a network script running to pull in the routing config from my routers and having a terrible time extracting the fields i need.
I have some regex that works in regex101 but not in splunk for some reason when using 'rex field=_raw' at search time. Code so far is below but not perfect:

^(?<Code>[\w\*\%\+]+)\s+(?<route>(\d{1,3}\.){3}\d{1,3}(\/\d+){0,1})\s.+?,\s+(?<Interface>[\w\-\.]+)

I have fudged the ip addresses in the data sample below for obvious reasons and would greatly appreciate some help. Extractions required are:

1 - Extract Codes (example L - local, ia - IS-IS inter area, * - candidate default) into a field called 'routing_codes'.
2 - Extract individual routing code letters (examples S*, C, L etc...) into a field called 'route_code'.
3 - Extract top level routing entry (examples 10.0.0.0/8, 99.0.0.0/32, 172.107.0.0/32) into field called 'iprange'
4 - Extract individual routes (example 192.168.79.123, 172.111.242.196, 172.107.79.123) into feild called 'route'
5 - Extract outgoing interfaces (example Vlan1, Vlan200, Loopback13) into field called 'interface'

Data Sample:

___________________________________________________________________________

10/09/2018 17:15:25 : Started route_scraper

Execute Command Script on Devices
4 devices selected


Devices: 4
Errors: 0
___________________________________________________________________________

router-r-s-71193-01 (10.2.199.98):

show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override
Gateway of last resort is 89.189.89.191 to network 0.0.0.0
S*    0.0.0.0/0 [1/0] via 89.189.88.190
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.71.193.0/24 is directly connected, Vlan1
L        10.71.193.1/32 is directly connected, Vlan1
      99.00.00.00/32 is subnetted, 1 subnets
C        99.99.99.199 is directly connected, Virtual-Access1.1
      172.168.0.0/32 is subnetted, 1 subnets
C        172.168.80.31 is directly connected, Loopback10
      172.168.0.0/32 is subnetted, 1 subnets
C        172.168.242.253 is directly connected, Loopback13
      192.168.80.0/32 is subnetted, 1 subnets
C        192.168.80.31 is directly connected, Loopback1


___________________________________________________________________________

router-r-s-72241-01 (10.2.199.99):

show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override
Gateway of last resort is 88.188.88.188 to network 0.0.0.0
S*    0.0.0.0/0 [1/0] via 88.189.89.189
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.72.241.0/24 is directly connected, Vlan1
L        10.72.241.1/32 is directly connected, Vlan1
      99.0.0.0/32 is subnetted, 1 subnets
C        99.99.199.198 is directly connected, Virtual-Access1.1
      172.17.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.17.1.80/28 is directly connected, Vlan200
L        172.17.1.81/32 is directly connected, Vlan200
      172.107.0.0/32 is subnetted, 1 subnets
C        172.107.79.123 is directly connected, Loopback10
      172.111.0.0/32 is subnetted, 1 subnets
C        172.111.242.196 is directly connected, Loopback13
      192.168.79.0/32 is subnetted, 1 subnets
C        192.168.79.123 is directly connected, Loopback1


___________________________________________________________________________

thanks

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Extract routing information from cisco router