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7.4.1 Configuring GTS for an Interface
To configure GTS for outbound traffic on an interface, use the following command in interface configuration mode:
Router(config-if)#
traffic-shape rate
bit-rate
7.4.2 Configuring GTS for an Access List
To configure GTS for outbound traffic on an access list, use the following commands beginning in global configuration
mode:
Command Purpose
access-list
access-list-number
Assigns traffic to an access list.
interface
interface-type-number
Enters interface configuration mode.
traffic-shape group
access-list-number
bit-rate
Configures traffic shaping for outbound traffic on an interface
for the specified access list.
Repeat the steps for each type of traffic you want to rate limit.
7.4.3 Monitoring the GTS Configuration
To monitor the current traffic shaping configuration and statistics, use the following commands in EXEC mode, as
needed:
Command Purpose
show traffic-shape
[
interface-type-
number
]
Displays the current traffic shaping configuration.
7.4.4 Generic Traffic Shaping Example
This example configures that the DNS traffic to eth13 have maximum bandwidth of 50M.
Defining the access list:
router(config)#
access-list 100 permit udp any any eq 53
Assigning the traffic shape to an interface:
router(config-if)#
traffic-shape
group 100 51200000
7.5 Random Early Detection
Random Early Detection (RED) is a congestion avoidance mechanism that takes advantage of the congestion control
mechanism of TCP. By randomly dropping packets prior to periods of high congestion, RED tells the packet source to
decrease its transmission rate. RED drops packets selectively based on IP precedence. Edge routers assign IP
precedences to packets as they enter the network.