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Configuring Traffic Filters and Protocol Prioritization
1-6
Filtering Strategies
This section suggests some ways you might use traffic filters in a network. Refer
to Appendix A for specific examples.
Drop or Accept Certain Traffic
To accept only specified traffic and drop other packets, configure accept filters.
To accept most traffic and drop only specified packets, configure filters only for
the traffic you want to drop.
For example, to prevent all NetBIOS traffic from entering a particular LAN
segment, you can create an inbound traffic filter to drop all packets with a
Destination or Source SAP code of F0.
Build a Firewall
If your filtering strategy involves blocking most traffic and accepting only
specified packets (a firewall) begin with a drop-all filter on the interface. That
means you choose a filter criterion that appears in every packet of the protocol you
are filtering (for example, a MAC address). Then, add more specific, higher-
precedence Accept and Drop filters to achieve the desired result on that interface.
Refer to “Using Drop-All Filters” in Appendix A for more information.
Direct Certain Traffic
You can create traffic filters that affect only a particular protocol’s traffic. For
example, you can forward all IP traffic to a next-hop address. You can also create
bridge traffic filters that affect certain locations on the network. For example, if
you want all traffic from a node with a particular MAC address (perhaps an
application server) to take precedence over other traffic, you can use protocol
prioritization to assign a high priority to any traffic with that source address.
Note: Drop filters usually perform more efficiently than accept filters.
- Protocol Prioritization 1
- Bay Networks Software License 3
- Contents 5
- About This Guide 15
- Before You Begin 16
- CompuServe 17
- How to Get Help 18
- Conventions 18
- Acronyms 20
- Chapter 1 21
- Using Traffic Filters 21
- Inbound Traffic Filters 22
- Outbound Traffic Filters 23
- What Do Traffic Filters Do? 25
- Filtering Strategies 26
- Components of Traffic Filters 27
- Predefined Criteria 28
- Using Traffic Filters 29
- User-Defined Criteria 31
- Filtering Actions 32
- Prioritizing Actions 32
- Using Filter Templates 33
- Chapter 2 35
- The Dequeuing Process 36
- Strict Dequeuing Algorithm 40
- Monitoring Statistics 42
- Percent of Bandwidth 43
- Queue Depth 43
- Queue Depth Example 44
- Reconfiguring Queue Depth 44
- Latency = 46
- Bits Queued 46
- Line Speed (bits per second) 46
- 2. Click on Edit Circuit 47
- (Figure 2-10) 50
- Chapter 3 59
- Transparent Bridge Actions 62
- Length (bits) 63
- Source Routing Actions 64
- IP Criteria and Actions 65
- IP Actions 66
- IPX Criteria and Actions 67
- XNS Criteria and Actions 68
- OSI Criteria and Actions 69
- User-Defined OSI Criteria 70
- OSI Actions 70
- Predefined DECnet Criteria 70
- VINES Criteria and Actions 71
- User-Defined VINES Criteria 72
- VINES Actions 72
- DLSw Criteria and Actions 73
- LLC2 Criteria and Actions 74
- Chapter 4 75
- Predefined Data Link Criteria 76
- Predefined IP Criteria 78
- Data Link Reference Points 80
- IP Reference Points 82
- Chapter 5 83
- Specifying MAC Address Ranges 84
- Table 5-3. SAP Codes 86
- (continued) 90
- Table 5-9. IP Protocol Codes 92
- Chapter 6 93
- <protocol> 94
- Click on Create 98
- Figure 6-8. Add Range Window 101
- 7. Click on OK 101
- Customizing Templates 104
- Editing a Template 105
- Creating an Inbound Filter 107
- Click on OK 108
- Editing an Inbound Filter 109
- Changing Filter Precedence 114
- Deleting an Inbound Filter 118
- Chapter 7 119
- Preparing Filter Templates 122
- Creating a New Template 123
- 2. Click on OK 129
- Creating an Outbound Filter 134
- Editing an Outbound Filter 136
- <protocol header> 138
- <filter criterion> 138
- Deleting an Outbound Filter 142
- Appendix A 143
- Configuration Examples and 143
- Implementation Notes 143
- Dial Backup Traffic 144
- Using Drop-All Filters 144
- • Length 148
- Length to 149
- (continued) 151
- Configuring DLSw 152
- Services 152
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