Information Technology Reference
In-Depth Information
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no ip rsvp data-packet classification:
Used to enable data packet classification. Used in an IntServ network architecture.
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ip rsvp pq-profile
:
Used to specify the profile (criteria) used by RSVP to direct flows into the priority queue of LLQ.
Used in an IntServ network architecture.
A predefined “voice-like” profile ensures that traffic from Cisco IOS devices and traffic from RSVP-enabled applications,
such as Microsoft NetMeeting, is directed to the priority queue in LLQ.
Note, however, that there is no RSVP support for LLQ with Frame Relay and ATM PVCs; nor is there support for tunnels.
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ip rsvp resource-provider none:
Used to specify no resource provider. Used in an IntServ/DiffServ network architecture.
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ip rsvp data-packet classification none:
Used to disable RSVP data packet classification. Used in an IntServ/DiffServ
network architecture.
For resources to be reserved across a network, an RSVP Path message, which contains a traffic specifier (Tspec) that specifies
bandwidth characteristics for a flow, is sent hop by hop across the network toward the destination. The destination then responds with
RSVP Resv, a message that constitutes a request for resources, and this travels hop by hop back across the network. (Any devices not
RSVP enabled simply transparently forward RSVP messages.) RSVP reservations are unidirectional in nature, so for a voice/video
call, two reservations are required.
Path and Resv messages are periodically retransmitted to maintain the resource reservation.
RSVP has two reservation types, distinct and shared, and several reservation styles, including Fixed Filter, Wildcard (Filter), and
Shared Explicit.
Reservation types specify how reservations for different senders are handled:
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Distinct:
A traffic flow originates from one sender, and each receiver has its own reservation with the sender.
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Shared:
A traffic flow from one or more senders, and a single reservation is shared by the senders.
Reservation styles indicate the number of senders and the type of reservation:
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Fixed Filter:
Indicates distinct reservations and an explicit sender
