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Configuring CoS to Manage VoIP Traffic When Running MX Series Router Cloud CPE Services

1. Configuring a Firewall Filter to Classify SIP VoIP Traffic
2. Configuring a Firewall Filter to Classify RTP Traffic for MX Series Router Cloud CPE CoS Services
3. Applying the SIP and RTP Firewall Filters for MX Series Router Cloud CPE CoS Services

Configuring a Firewall Filter to Classify SIP VoIP Traffic

1. Configure an IPv4 firewall filter that checks for packets from the UDP protocol.
   [edit]user@host# edit firewall family inet filter voip-filter term sip fromuser@host# set protocol udp
2. Configure the same IPv4 firewall filter to check for packets from the TCP protocol.
   [edit firewall family inet filter voip-filter term sip from]user@host# set from protocol tcp
3. Specify which port is used for UDP and TCP traffic.
   [edit firewall family inet filter voip-filter term sip from]user@host# set port 5060
4. Classify the UDP and TCP packets to the named forwarding class.
   [edit firewall family inet filter voip-filter term sip from]user@host# up[edit firewall family inet filter voip-filter term sip]user@host# set then forwarding-class cos-voice
5. Specify that packets matching the filter conditions are accepted.
   [edit firewall family inet filter voip-filter term sip]user@host# set then accept
6. Verify the configuration.
   user@host# show

   from {
       protocol [ udp tcp ];
       port 5060;
   }
   then {
       forwarding-class cos-voice;
       accept;
   }
   

Configuring a Firewall Filter to Classify RTP Traffic for MX Series Router Cloud CPE CoS Services

1. Configure an IPv4 firewall filter that checks for packets from the UDP protocol.
   [edit firewall family inet filter voip-filter term sip]user@host# up[edit firewall family inet filter voip-filter]user@host# edit term rtp from user@host# set protocol udp
2. Specify which port is used for UDP and TCP traffic.
   [edit firewall family inet filter voip-filter term rtp from]user@host# set port 16384-32767
3. Classify the UDP and TCP packets to the named forwarding class. Specify the same forwarding class you configured for SIP traffic.
   [edit firewall family inet filter voip-filter term rtp from]user@host# up[edit firewall family inet filter voip-filter term rtp]user@host# set then forwarding-class cos-voice
4. Specify that packets matching the filter conditions are accepted.
   [edit firewall family inet filter voip-filter term rtp]user@host# set then accept
5. Verify the configuration.
   user@host# show

   from {
       protocol udp;
       port 16384-32767;
   }
   then {
       forwarding-class cos-voice;
       accept;
   }
   

Applying the SIP and RTP Firewall Filters for MX Series Router Cloud CPE CoS Services

• To apply the firewall filter, specify the logical interface unit-number designated for the subscriber’s IRB interface, and specify the filter name you defined for SIP and RTP.
  [edit]user@host# edit interfaces irb unit 33 family inet filter input user@host# set voip-filter