Cisco Systems BC-109 manual Access Filters Example, Fast-Switching Example

Access Filters Example

Access Filters Example

Figure 69 shows two routers connecting two Token Rings to an FDDI backbone.

Figure 69 Network Configuration Using NetBIOS Access Filters

	NetBIOS server
NetBIOS clients	FILESVR3

	Token	FDDI	Token
	Ring		Ring
	Router A		Router B
			IBM FEP
3174	3174		address
			0110.2222.3333

S1112a

Suppose you want to permit the IBM 3174 cluster controllers to access the FEP at address 0110.2222.3333, and also want the NetBIOS clients to access the NetBIOS server named FILESVR3. The following set of router configuration commands would meet this need:

netbios access-list host MIS permit FILESVR3 netbios access-list host MIS deny *

!

access-list 202 permit 0x0404 0x0001 ! Permits SNA frames (command or response) access-list 202 permit 0x0004 0x0001 ! Permits SNA Explorers with NULL DSAP

!

access-list 701 permit 0110.2222.3333

!

interface tokenring 0

access-expression in (lsap(202) & dmac(701)) netbios-host(MIS)

Fast-Switching Example

The following example disables fast switching between two Token Ring interfaces in the same router. Frames entering Token Ring interfaces 0 or 1 will not be fast switched to the other interface.

!global command establishing the ring group for the interface configuration commands source-bridge ring-group 2

!commands that follow apply to interface token 0

interface tokenring 0

!enable srb between local ring 1, bridge 1, and target ring 2 source-bridge 1 1 2

!disable source-route fast-switching cache on interface token 0 no source-bridge route-cache

interface token 1

!enable srb between local ring 2, bridge 1, and target ring 1 source-bridge 2 1 1

no source-bridge route-cache

Configuring Source-Route Bridging BC-163