From: Cristian Henry H (chenry@reuna.cl)
Date: Thu Sep 11 2003 - 11:17:58 GMT-3
Gary,
- Sets the local preference to 70 for any 192.168.x.0/24 network or
subnet.
I think the prefix list you have to write here is the following:
ip prefix-list test23 permit 192.168.0.0/16 ge 24 le 32
Gary Bartlett ha escrito:
>
> 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
>
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-- Cristian E. Henry REUNAE-mail: chenry@reuna.cl Fono: 56-2-3370336
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