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1366 Views 4 Replies Latest reply: Apr 7, 2012 7:06 PM by Paul Stewart - CCIE Security RSS

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Extended ACLs

Mar 7, 2012 4:33 PM

Sampath Weerasinghe - CCIE 203 posts since
Oct 3, 2009

Hi I'm looking for a good documentation or description of extended acls. Specifically

the following aspects-

if I deny tcp any any

then permit ip any any

what happens to udp traffic..? denied or permitted


How about if I create a new extended acl, then permit pim any any. What happens to

the other protocols like ip,tcp,igmp,... are they implicitly denied?


R5(config)#access-list 101 permit ?

  <0-255>  An IP protocol number

  ahp      Authentication Header Protocol

  eigrp    Cisco's EIGRP routing protocol

  esp      Encapsulation Security Payload

  gre      Cisco's GRE tunneling

  icmp     Internet Control Message Protocol

  igmp     Internet Gateway Message Protocol

  ip       Any Internet Protocol

  ipinip   IP in IP tunneling

  nos      KA9Q NOS compatible IP over IP tunneling

  ospf     OSPF routing protocol

  pcp      Payload Compression Protocol

  pim      Protocol Independent Multicast

  tcp      Transmission Control Protocol

  udp      User Datagram Protocol


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