Chapter 8 Route
8.2.1 Assured Forwarding (AF) PHB for DiffServ
Assured Forwarding (AF) behavior is defined in RFC 2597. The AF behavior group defines four AF classes. Inside each class, packets are given a high, medium or low drop precedence. The drop precedence determines the probability that routers in the network will drop packets when congestion occurs. If congestion occurs between classes, the traffic in the higher class (smaller numbered class) is generally given priority. Combining the classes and drop precedence produces the following twelve DSCP encodings from AF11 through AF43. The decimal equivalent is listed in brackets.
Table 45 Assured Forwarding (AF) Behavior Group
| CLASS 1 | CLASS 2 | CLASS 3 | CLASS 4 |
Low Drop Precedence | AF11 (10) | AF21 (18) | AF31 (26) | AF41 (34) |
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Medium Drop Precedence | AF12 (12) | AF22 (20) | AF32 (28) | AF42 (36) |
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High Drop Precedence | AF13 (14) | AF23 (22) | AF33 (30) | AF43 (38) |
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8.2.2 Policy Route Command Example
The following commands create two address objects (TW_SUBNET and GW_1) and insert a policy that routes the packets (with the source IP address TW_SUBNET and any destination IP address) through the interface ge1 to the
Router(config)#
index: 1 active: yes description: example user: any schedule: none interface: ge1 tunnel: none sslvpn: none source: TW_SUBNET destination: any DSCP code: any service: any nexthop type: Gateway nexthop: GW_1
nexthop state: Not support
auto destination: no
bandwidth: 0
bandwidth priority: 0
maximize bandwidth usage: no
SNAT:
DSCP marking: preserve
amount of port trigger: 0 Router(config)#
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ZyWALL (ZLD) CLI Reference Guide | |
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