From: Gary Bartlett (ciscokid@sympatico.ca)
Date: Thu Sep 11 2003 - 10:49:45 GMT-3
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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