Date created: Tuesday, May 21, 2013 10:07:26 AM. Last modified: Tuesday, September 12, 2017 11:29:22 AM
IOS Regex
NB: To enter a question mark ? character, use CTRL+SHIFT+V and then the question mark.
Regex Syntax (from INE)
+------------------------------------------------------+ | CHAR | USAGE | +------------------------------------------------------| | ^ | Start of string | |------|-----------------------------------------------| | $ | End of string | |------|-----------------------------------------------| | [] | Range of characters | |------|-----------------------------------------------| | - | Used to specify range ( i.e. [0-9] ) | |------|-----------------------------------------------| | ( ) | Logical grouping | |------|-----------------------------------------------| | . | Any single character | |------|-----------------------------------------------| | * | Zero or more instances | |------|-----------------------------------------------| | + | One or more instance | |------|-----------------------------------------------| | ? | Zero or one instance | |------|-----------------------------------------------| | _ | Comma, open or close brace, open or close | | | parentheses, start or end of string, or space | +------------------------------------------------------+ +-------------+---------------------------+ | Expression | Meaning | |-------------+---------------------------| | .* | Anything | |-------------+---------------------------| | ^$ | Locally originated routes | |-------------+---------------------------| | ^100_ | Learned from AS 100 | |-------------+---------------------------| | _100$ | Originated in AS 100 | |-------------+---------------------------| | _100_ | Any instance of AS 100 | |-------------+---------------------------| | ^[0-9]+$ | Directly connected ASes | +-------------+---------------------------+
IOS Regex (from Cisco IOS Essentials 2.9 book):
^200$ match AS200 only .* match anything .+ match at least one character ^* match all ASes including local AS ^$ match this AS only ^200_ match all ASes received from AS200 _200_ match all ASes which have AS200 in the path _200$ match all ASes with AS200 origin only, whatever the path ^200_210$ match AS210 origin and received from AS200 only _200_210_ match all ASes which have been through AS200 fl‡ AS210 link ^(200_)+$ match at least one of AS200 (or multiple occurrences of one AS, usually from AS_PATH stuffing) ^(_[0-9]+)$ match at least one AS (or multiple occurrences of one AS) _\(65350\)_ match all ASes which have confederation sub-AS 65350 in the path ^[0-9]+$ match AS_PATH length of one ^[0-9]+_[0-9]+$ match AS_PATH length of two ^[0-9]*_[0-9]+$ match AS_PATH length of one or two ^[0-9]*_[0-9]*$ match AS_PATH length of one or two ^[0-9]+_[0-9]+_[0-9]+$ match AS_PATH length of three _(701|1800)_ match anything which has gone through AS701 or AS1800 _1849(_.+_)12163$ match anything of origin AS12163 and passed through AS1849
IOS Regex
Show access lists applied to interfaces
show ip interface | include line protocol|access list
Router Commands
Extended community lists:
ip extcommunity-list expanded eBGP-VPNv4-FILTER-EXTCOMM permit RT:65002:*
ip extcommunity-list expanded RT-Filter permit 10:[1-2]*
ip extcommunity-list 500 deny _65412_
BGP regex:
! Show paths with at least 15 AS hops in the path show bgp vpnv4 unicast all regexp .+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+_ ! Show paths that contain AS 12345 in the path (they transit AS 12345): _12345_ ! Show paths that originate from a specific AS _12345$ ! Show paths that are received from direct peer AS 12345 ^12345_ ! Show only local AS paths ^$ ! Show directly connected AS/peer routes ^[0-9]+$
Switch Commands
Show unused/down interfaces:
as04#sh int counters Port InOctets InUcastPkts InMcastPkts InBcastPkts Gi0/1 241238746846 258976893 1646800 779998 Gi0/2 83902902665 186971249 31149 580250 Gi0/3 983670603 1107836 58664 627 Gi0/4 0 0 0 0 Gi0/5 238576004381 225394145 4 357 Gi0/6 76762626832 203773545 16 1429506 Gi0/7 0 0 0 0 ....... as04#show int counters | i _0_.*_0_.*_0_.*_0_ Gi0/4 0 0 0 0 Gi0/7 0 0 0 0 Gi0/8 0 0 0 0 Gi0/12 0 0 0 0 ...... as04#sh int count | i 0 +0 + 0 +0 Gi0/4 0 0 0 0 Gi0/7 0 0 0 0 Gi0/8 0 0 0 0 Gi0/12 0 0 0 0 ......
sh int | i FastEthernet|0 packets input
sh int | i GigabitEthernet|0 packets input
GigabitEthernet0/1 is up, line protocol is up (connected)
GigabitEthernet0/2 is up, line protocol is up (connected)
GigabitEthernet0/3 is up, line protocol is up (connected)
GigabitEthernet0/4 is down, line protocol is down (notconnect)
0 packets input, 0 bytes, 0 no buffer
GigabitEthernet0/5 is up, line protocol is up (connected)
225550140 packets input, 238695608139 bytes, 0 no buffer
GigabitEthernet0/6 is up, line protocol is up (connected)
GigabitEthernet0/7 is down, line protocol is down (notconnect)
0 packets input, 0 bytes, 0 no buffer
Show physical interfaces not sub-interfaces
! IOS-XR ASR9000 RP/0/RSP1/CPU0:pe1#show int desc | utility egrep -e "Te.*/0 |Te.*/1 |Te.*/2 |Te.*/3 " Te0/0/0/0 up up Physical-to-aaa Te0/0/0/1 up up Link-to-zzz:Nexus7K2:E1/7 Te0/0/0/2 up up Link-to-zzz:Nexus7K1:E1/7 Te0/0/0/3 up up Physical-to-xxxx-sw1:Eth1/48 Te0/1/0/0 up up Physical-to-xxx-pe2:Te0/1/0/0 Te0/1/0/1 up up Physical-to-yyy-SW1:Internet-Outside-VRF:CCP000113 Te0/1/0/2 up up Physical-to-yyy-SW1:All-VRFs:CCP000105 Te0/1/0/3 up up Physical-to-yyy:PWE3-105-to-CPK:CCP000115 ! Improved to mix 1G and 10G interfaces RP/0/RSP0/CPU0:abr1#show int desc | i "Te|Gi" | inc "/[0-9][0-9]? " Gi0/0/0/0 up up xxxxxxx Gi0/0/0/1 up up xxxxxxx Gi0/0/0/2 up up xxxxxxx ... Gi0/0/0/17 admin-down admin-down xxxxxxx Gi0/0/0/18 admin-down admin-down xxxxxxx Gi0/0/0/19 up up xxxxxxx Te0/0/1/0 up up xxxxxxx Te0/0/1/1 up up xxxxxxx Te0/0/1/2 up up xxxxxxx Te0/0/1/3 admin-down admin-down xxxxxxx Te0/0/2/0 up up xxxxxxx Te0/0/2/1 up up xxxxxxx Te0/0/2/2 up up xxxxxxx Te0/0/2/3 up up xxxxxxx ! Improved to a single statement RP/0/RSP0/CPU0:abr1#show int desc | i "[Te|Gi].*/[0-9][0-9]? " Gi0/0/0/0 up up xxxxxxx Gi0/0/0/1 up up xxxxxxx Gi0/0/0/2 up up xxxxxxx ... Gi0/0/0/17 admin-down admin-down xxxxxxx Gi0/0/0/18 admin-down admin-down xxxxxxx Gi0/0/0/19 up up xxxxxxx Te0/0/1/0 up up xxxxxxx Te0/0/1/1 up up xxxxxxx Te0/0/1/2 up up xxxxxxx Te0/0/1/3 admin-down admin-down xxxxxxx Te0/0/2/0 up up xxxxxxx Te0/0/2/1 up up xxxxxxx Te0/0/2/2 up up xxxxxxx Te0/0/2/3 up up xxxxxxx
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