Cisco 3825 - Manual (Page 76)

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Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide
OL-15667-03
Chapter 4 Configuring the Cisco 3825 Mobile Wireless Edge Router in a RAN-O Solution with the Command-Line
Configuration Sequence
Step 2 Specify an identification number for the multilink interface.
Router(config-if)# ppp multilink group group-number
Where group-number is the multilink group number.
For example, the following command restricts (identifies) the multilink interface, 5, that can be
negotiated:
Router(config-if)# ppp multilink group 5
Step 3 Enable keepalive packets on the interface and specify the number of times the keepalive packets will be
sent without a response before bringing down the interface.
Router(config-if)# keepalive [ period [retries]]
Where:
• period—(Optional) Integer value in seconds greater than 0. The default is 10.
• retries—(Optional) Specifies the number of times that the device will continue to send keepalive
packets without response before bringing the interface down. Integer value greater than 1 and less
than 255. If omitted, the value that was previously set is used; if no value was specified previously,
the default of 5 is used.
For example, the following command restricts (identifies) the multilink interface, 5, that can be
negotiated:
Router(config-if)# keepalive 1 5
Enable Real-Time Transport Protocol (RTP) Header-Compression
To enable RTP Header Compression, follow these steps, while in the interface configuration mode:
Step 1 Enable RTP header-compression.
Router(config-if)# ip rtp header-compression [passive | iphc-format | ietf-format]
[periodic-refresh]
Where:
• passive—(Optional) Compresses outgoing RTP packets only if incoming RTP packets on the same
interface are compressed. If you do not specify the passive keyword, all RTP packets are
compressed. This option is not applicable on PPP links.
• iphc-format—(Optional) Indicates that the IP Header Compression (IPHC) format of header
compression will be used.
• ietf-format—(Optional) Indicates that the Internet Engineering Task Force (IETF) format of header
compression will be used.
• periodic-refresh—(Optional) Indicates that the compressed IP header will be refreshed
periodically.
For example, the following command enables RTP header-compression in the Internet IETF format by
suppressing the IP ID in the RTP/UDP header compression:
Router(config-if)# ip rtp header-compression ietf-format ignore-id