Default Routing Engine Protocol Queue Assignments

Table 13 lists how Routing Engine-sourced traffic is mapped to output queues. The follow caveats apply to Table 13:

• For all packets sent to queue 3 over a VLAN-tagged interface, the software sets the 802.1p bit to 110.
• For IPv4 and IPv6 packets, the software copies the IP type-of-service (ToS) value into the 802.1p field independently of which queue the packets are sent out.
• For MPLS packets, the software copies the EXP bits into the 802.1p field.

  Table 13: Routing Engine Protocol Queue Assignments

  Routing Engine Protocol	Queue Assignment
  Cisco High-Level Data Link Control (HDLC)	Queue 3
  Point-to-Point Protocol (PPP)	Queue 3
  Frame Relay Local Management Interface (LMI)	Queue 3
  Frame Relay Asynchronization permanent virtual circuit (PVC)/data link connection identifier (DLCI) status messages	Queue 3
  Multilink Frame Relay Link Integrity Protocol (LIP)	Queue 3
  ATM Operation, Administration, and Maintenance (OAM)	Queue 3
  Intermediate System-to-Intermediate System (IS-IS) Open Systems Interconnection (OSI)	Queue 3
  Open Shortest Path First (OSPF) protocol data unit (PDU)	Queue 3
  Distance Vector Multicast Routing Protocol (DVMRP)	Queue 3
  Link Aggregation Control Protocol (LACP)	Queue 3
  IP version 6 (IPv6) Neighbor Solicitation	Queue 3
  IPv6 Neighbor Advertisement	Queue 3
  IPv6 Router Advertisement	Queue 0
  Protocol Independent Multicast (PIM)	Queue 3
  Routing Information Protocol (RIP)	Queue 3
  Multicast listener discovery (MLD)	Queue 0
  Resource Reservation Protocol (RSVP)	Queue 3
  Label Distribution Protocol (LDP) User Datagram Protocol (UDP) hello	Queue 3
  LDP keepalive and Session data	Queue 0
  LDP TCP Retransmission	Queue 3
  Border Gateway Protocol (BGP)	Queue 0
  BGP TCP Retransmission	Queue 3
  Multicast Source Discovery Protocol (MSDP)	Queue 0
  MSDP TCP Retransmission	Queue 3
  Bidirectional Forwarding Detection (BFD) Protocol	Queue 3
  Virtual Router Redundancy Protocol (VRRP)	Queue 0
  Internet Group Management Protocol (IGMP) query	Queue 3
  IGMP Report	Queue 0
  Simple Network Management Protocol (SNMP)	Queue 0
  Telnet	Queue 0
  FTP	Queue 0
  SSH	Queue 0
  xnm-clear-text	Queue 0
  xnm-ssl	Queue 0
  Link Services (LS) PIC	If link fragmentation and interleaving (LFI) is enabled, all routing protocol packets larger then 128 bytes are transmitted from queue 0. This ensures that VoIP traffic is not affected. Fragmentation is supported on queue 0 only.
  Adaptive Services PIC	TCP tickle (keepalive packets for idle session generated with stateful firewall to probe idle TCP sessions) are sent from queue 0.
  Real-time performance monitoring (RPM) probe packets	Queue 3

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