From: raj_tpd@comcast.net
Date: Fri Sep 12 2003 - 01:33:53 GMT-3
Here is what I think.
For
1. sets the local pref to 400 for any paths learned directly from AS 698 that
pass through AS 405.
Answer i think: ip as-path access-list 12 permit ^698_(.+_)*405_
when you said ^698_(.+_)*405_(.+_)$ means received from AS698 pass through any
number of AS then match 0 or more sequence of AS405 and then match again any
number of AS till origin.
Why do it that way when there is a build in function.
^698_(.+_)*405_
Where it says received from AS698, match any number of AS in between then match
AS405 and then I don't care what else it passes through till origin. I only
care about received AS and pass through AS405. Leave the rest on the program to
figure it out.
For
2. Sets the weight to 10,000 and the local preference to 60 for networks in the
range 172.16.0.0/16 to 172.31.0.0/16 network, and any of their subnets.
Answer i think: ip prefix-list test22 seq 5 permit 172.16.0.0/12 ge 16 le 32
This is saying match first 12 bits exactly what I have said and then from bit
16 to 32 I do not care.
I think the rest looks good.
I might be totally off, I that case please do correct me. I will learn a thing
or two. Just my 2 cents.
Raj
> So it's coming down to the wire for me now, I'll be taking the exam on
> Sept 18th in RTP. There are still a few things I'm not comfortable with,
> so if you could help me with these I'd appreciate it.
> Thanks,
> Gary
>
> 1. Construct a route map that sets the BGP local preference to 200 for
> any paths learned directly from AS 307, sets the local pref to 400 for
> any paths learned directly from AS 698 that pass through AS 405, and
> denies all other paths.
> 2. Construct a route map that:
> - Sets the origin code to "incomplete" and the local preference to 50
> for the 10.0.0.0/8 network and any of its subnets.
> - Sets the weight to 10,000 and the local preference to 60 for networks
> in the range 172.16.0.0/16 to 172.31.0.0/16 network, and any of their
> subnets.
> - Sets the local preference to 70 for any 192.168.x.0/24 network or
> subnet.
> - Denies all other prefixes.
>
> MY ANSWERS
> 1)
> route-map ex1 permit 10
> match as-path 11
> set local-preference 200
> route-map ex1 permit 20
> match as-path 12
> set local-preference 400
> ip as-path access-list 11 permit ^307_
> ip as-path access-list 12 permit ^698_(.+_)*405_(.+_)$
> -------------------------
>
> 2)
> route-map ex2 permit 10
> match ip address prefix test21
> set origine incomplete
> set local-preference 50
> route-map ex2 permit 20
> match ip address prefix test22
> set weight 10000
> set local-preference 60
> route-map ex2 permit 30
> match ip address prefix test23
> set local-preference 70
> ip prefix-list test21 seq 5 permit 10.0.0.0/8 le 32
> ip prefix-list test22 seq 5 permit 172.16.0.0/12 ge 16 le 32
> ----------------------
> ip prefix-list test23 seq 5 permit 192.168.0.0/16 le 32
>
> COMMENTS:
> 1) My problem is that they said passed through as 405, but they didn't
> say originated from AS 405, that's why my answer is different...
> 2) I added ge 16 because in the question they said that the 3rd octet
> could be any # in the range of 16 to 31, but the subnet would still be
> /16 to /32...
> THERE ANSWERS
> 1.
> route-map test1 permit 10
> match as-path 1
> set local preference 200
> route-map test1 permit 20
> match as-path 11
> set local preference 400
>
> ip as-path access-list 1 permit ^307_
> ip as-path access-list 11 permit ^698_(.+_)*405_ -----------------
> 2.
> route-map test2 permit 10
> match ip address prefix test2a
> set origin incomplete
> set local-preference 50
> route-map test2 permit 20
> match ip address prefix test2b
> set weight 10000
> set local-preference 60
> route-map test2 permit 30
> match ip address prefix test2c
> set local-preference 70
> ip prefix-list test2a seq 5 permit 10.0.0.0/8 le 32
> ip prefix-list test2b seq 5 permit 172.16.0.0/12 le 32
> ----------------
> ip prefix-list test2c seq 5 permit 192.168.0.0/16 le 32
>
>
> _______________________________________________________________________
> You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Wed Oct 01 2003 - 07:24:26 GMT-3