Cisco Systems BC-109 manual Filtering Bridged Token Ring Packets to IBM Machines Example

SRB Configuration Examples

Access lists are scanned in order. In the following example, the first list denies all entries beginning with the letters ABC, including one named ABCD. This voids the second command, because the entry permitting a name with ABCD comes after the entry denying it.

netbios access-list host marketing deny ABC* netbios access-list host marketing permit ABCD

Filtering Bridged Token Ring Packets to IBM Machines Example

The example in Figure 67 disallows the bridging of Token Ring packets to all IBM workstations on Token Ring 1.

Figure 67 Router Filtering Bridged Token Ring Packets to IBM Machines

T2

Token Ring 2

3174

	3174
	Token
T1	Ring 1
		3174
			S1276a

This example assumes that all hosts on Token Ring 1 have Token Ring addresses with the vendor code 1000.5A00.0000. The first line of the access list denies access to all IBM workstations, while the second line permits everything else. The access list is assigned to the input side of Token Ring 1.

! deny access to all		IBM workstations
access-list 700	deny	1000.5A00.0000	8000.00FF.FFFF
! permit all other traffic
access-list 700	permit 0000.0000.0000		FFFF.FFFF.FFFF
!
interface token	ring	1

!apply access list 700 to the input side of Token Ring 1 source-bridge input-address-list 700

BC-160Bridging and IBM Networking Configuration Guide