|
Cs 552 Computer Networks Quality Of Service
|
| bet | 7/12 | | Sana | 26.12.2023 | | Hajmi | 492 Kb. | | #128375 |
Bog'liq qos-f05 - When R gets PATH message it knows
- Traffic characteristics (tspec): (r,b,R)
- Number of hops
- R sends back this information + worst-case delay in RESV
- Each router along path provide a per-hop delay guarantee and forward RESV with updated info
- In simplest case routers split the delay
Reservation Style - Motivation: achieve more efficient resource utilization in multicast (M x N)
- Observation: in a video conferencing when there are M senders, only a few can be active simultaneously
- Multiple senders can share the same reservation
- Various reservation styles specify different rules for sharing among senders
- Reservation style
- use filter to specify which sender can use the reservation
- Three styles
- Wildcard filter: does not specify any sender; all packets associated to a destination shares same resources
- Group in which there are a small number of simultaneously active senders
- Fixed filter: no sharing among senders, sender explicitly identified for the reservation
- Sources cannot be modified over time
- Dynamic filter: resource shared by senders that are (explicitly) specified
Wildcard Filter Example - Receivers: H1, H2; senders: H3, H4, H5
- Each sender sends B
- H1 reserves B; listen from one server at a time
|
| |
