Hi Guys,
I'm reading Routing TCP/IP, Volume II: CCIE Professional Development, 2nd Edition. I have a quesiton in Ch3, the example 3-45 as below:
router eigrp 100
network 192.168.199.0
!
router bgp 100
aggregate-address 192.168.192.0 255.255.248.0
redistribute eigrp 100
neighbor 192.168.1.253 remote-as 200
neighbor 192.168.1.253 send-community
neighbor 192.168.1.253 route-map COMMUNITY out
!
ip classless
!
access-list 101 permit ip host 192.168.192.0 host 255.255.248.0
!
route-map COMMUNITY permit 10
match ip address 101
set community none
!
route-map COMMUNITY permit 20
set community no-export
"The usage of access list 101 in this example may be new to you. Normally, the first address specified in an extended IP access list is the source address, and the second address is the destination. But in this application, the first address is the route prefix and the second address is the prefix’s mask. The reason such an odd access list is necessary is because the exact prefix must be identified. If access-list 1 permit 192.168.192.0 0.0.7.255 were used, it would match both the aggregate 192.168.192.0/21 and the more-specific route 192.168.192.0/24."
I tot ACL in route filtering will only match the exact prefixt? Only prefixt-list is able to match a range by using ge and le? Why here it says the access-list 1 can match both /21 and /24?
Thanks
