Re: prefix and acl

Here you are again arguing (and being very rude) to a CCIE again (Marko is
actually a 2X CCIE). The only reason you find the question vague is because
you lack the knowledge to understand the question. Marko was taking the
time to try to explain it and more detail to you and you act ungrateful and
tell him to think before he responds.

You should probably consider going to a CCNP study group until you have a
stronger foundation to discuss these topics, or at the very least learn to
be respectful and admit that it is YOU that needs more explanation and to
ask for it nicely.

-Marc Abel
CCIE #35470

On Sun, Jun 24, 2012 at 6:50 PM, john matijevic <john.matijevic_at_gmail.com>wrote:

> Marko,
>
> Hasse was very vague with his question, since you understood what his
> question is I asked you to state it. Then Hasse responded with
> clarification.
> Please think before you respond.
>
> Regards
> John
>
>
> On 6/24/12, Marko Milivojevic <markom_at_ipexpert.com> wrote:
> > He's asking can he filter a specific prefix using an extended access
> > list, instead of using a prefix list. He gives an example where he
> > tried with a prefix-list and the example where he tried an acl, with
> > obviously different results. Someone very quickly pointed out the
> > difference, with the link to the Cisco's and INE's blog describing the
> > particular use-case. Case closed, moving on. Don't overthink the
> > questions.
> >
> > --
> > Marko Milivojevic - CCIE #18427 (SP R&S)
> > Senior CCIE Instructor - IPexpert
> >
> > On Sun, Jun 24, 2012 at 3:29 PM, john matijevic
> > <john.matijevic_at_gmail.com> wrote:
> >> Good Afternoon Marko,
> >>
> >> Please enlighten us.
> >>
> >> Here is the question:
> >>
> >> Can I do this with an acl or extended cal,
> >>
> >>
> >> Please clarify what this is? I don't understand what he is asking?
> >>
> >> Regards,
> >> John
> >> On 6/24/12, Marko Milivojevic <markom_at_ipexpert.com> wrote:
> >>> He did post the config snippets. I think the question was very clear.
> >>> So were the answers :-)
> >>>
> >>> --
> >>> Marko Milivojevic - CCIE #18427 (SP R&S)
> >>> Senior CCIE Instructor - IPexpert
> >>>
> >>> On Sun, Jun 24, 2012 at 12:27 PM, john matijevic
> >>> <john.matijevic_at_gmail.com> wrote:
> >>>> Good Afternoon,
> >>>>
> >>>> "Can I do this with an acl or extended cal, I have a Brain Freeze
> >>>> Thanks."
> >>>>
> >>>> What is this?
> >>>>
> >>>> Very vague, can you please be more specific and describe exactly the
> >>>> issue or problem that you are trying to solve?
> >>>>
> >>>> Please post network diagram and configurations.
> >>>>
> >>>>
> >>>> Regards,
> >>>> John
> >>>>
> >>>>
> >>>> On 6/24/12, Sarad <tosara_at_gmail.com> wrote:
> >>>>> Hi Hasse,
> >>>>>
> >>>>> We can use a extended access-list in BGP to replace a prefix-list,
> But
> >>>>> in
> >>>>> IGP it appears differently as extended accesslist represent the route
> >>>>> source and subnet (not subnet and subnet mask)
> >>>>>
> >>>>> Have a look at this
> >>>>>
> http://blog.internetworkexpert.com/2008/01/04/using-extended-access-lists-in-a-distribute-list/
> >>>>>
> >>>>> Cheers
> >>>>> Sara
> >>>>>
> >>>>>
> >>>>>
> >>>>> On Sun, Jun 24, 2012 at 11:12 PM, <daniel.dib_at_reaper.nu> wrote:
> >>>>>
> >>>>>> Hi Hasse,
> >>>>>>
> >>>>>> You are trying to match every class C address with /24 mask right?
> >>>>>> This
> >>>>>> is
> >>>>>> not possible with a standard ACL. If you used extended ACL you could
> >>>>>> match
> >>>>>> mask like this.
> >>>>>>
> >>>>>> access-list 100 permit 192.0.0.0 31.255.255.255 host 255.255.255.0
> >>>>>>
> >>>>>> However I think this is only supported in BGP.
> >>>>>>
> >>>>>> /Daniel
> >>>>>>
> >>>>>>
> >>>>>> On Sun, 24 Jun 2012 14:02:01 +0200, Hasse wrote:
> >>>>>>
> >>>>>>> Can I do this with an acl or extended cal, I have a Brain Freeze
> >>>>>>> Thanks.
> >>>>>>>
> >>>>>>> R2#show run | sec rip
> >>>>>>> router rip
> >>>>>>> version 2
> >>>>>>> network 10.0.0.0
> >>>>>>> distribute-list prefix 1 in FastEthernet0/0
> >>>>>>> no auto-summary
> >>>>>>>
> >>>>>>> R2#show run | sec prefix-list
> >>>>>>> ip prefix-list 1 seq 5 permit 192.0.0.0/3 ge 24 le 24
> >>>>>>>
> >>>>>>> R2#show ip route rip
> >>>>>>> R 223.1.1.0/24 [120/1] via 10.1.12.1, 00:00:19, FastEthernet0/0
> >>>>>>> R 200.1.1.0/24 [120/1] via 10.1.12.1, 00:00:19, FastEthernet0/0
> >>>>>>> R 192.1.1.0/24 [120/1] via 10.1.12.1, 00:00:19, FastEthernet0/0
> >>>>>>> R 195.1.1.0/24 [120/1] via 10.1.12.1, 00:00:19, FastEthernet0/0
> >>>>>>>
> >>>>>>> if I am using a standard ACL
> >>>>>>>
> >>>>>>>
> >>>>>>> Standard ACL
> >>>>>>> R2#show run | sec rip
> >>>>>>> router rip
> >>>>>>> version 2
> >>>>>>> network 10.0.0.0
> >>>>>>> distribute-list 1 in FastEthernet0/0
> >>>>>>> no auto-summary
> >>>>>>>
> >>>>>>> R2#show run | sec access-list
> >>>>>>> access-list 1 permit 192.0.0.0 31.255.255.0
> >>>>>>>
> >>>>>>> R2#show ip ro rip
> >>>>>>> R 223.1.1.0/24 [120/1] via 10.1.12.1, 00:00:07, FastEthernet0/0
> >>>>>>> R 200.1.1.0/24 [120/1] via 10.1.12.1, 00:00:07, FastEthernet0/0
> >>>>>>> 193.1.1.0/25 is subnetted, 1 subnets
> >>>>>>> R 193.1.1.0 [120/1] via 10.1.12.1, 00:00:07, FastEthernet0/0
> >>>>>>> R 192.1.1.0/24 [120/1] via 10.1.12.1, 00:00:07, FastEthernet0/0
> >>>>>>> R 195.1.1.0/24 [120/1] via 10.1.12.1, 00:00:07, FastEthernet0/0
> >>>>>>> 194.1.1.0/26 is subnetted, 1 subnets
> >>>>>>> R 194.1.1.0 [120/1] via 10.1.12.1, 00:00:07, FastEthernet0/0
> >>>>>>>
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-- 
Marc Abel
CCIE #35470
(Routing and Switching)
Blogs and organic groups at http://www.ccie.net