в мануале написано:
The Cisco Catalyst 2950 Series offers superior and highly granular QoS to ensure that network traffic is classified
and prioritized, and that congestion is avoided in the best possible manner. The Cisco Catalyst 2950 Series can
classify, reclassify, police (determine if the packet is in or out of predetermined profiles and affect actions on the
packet), and mark or drop the incoming packets before the packet is placed in the shared buffer. Packet classification
allows the network elements to discriminate between various traffic flows and enforce policies based on Layer 2 and
Layer 3 QoS fields.
To implement QoS, first, the Cisco Catalyst 2950 Series switches identify traffic flows, or packet groups, and classify
or reclassify these groups using either the Differentiated Services Code Point (DSCP) field or the 802.1p
class-of-service (CoS) field, or both. Classification and reclassification can be based on criteria as specific as the
source/destination IP address, source/destination Media Access Control (MAC) address, or the Layer 4 Transmission
Control Protocol/User Datagram Protocol (TCP/UDP) port. At the ingress, the Cisco Catalyst 2950 Series can also
perform policing and marking of the packet.
After the packet goes through classification, policing, and marking, it is then assigned to the appropriate queue before
exiting the switch. The Cisco Catalyst 2950 Series supports four egress (outgoing port) queues per port, which allows
the service provider to be more discriminating and specific in assigning priorities for the various applications. At the
egress, the switch performs Weighted Round Robin (WRR) or strict priority scheduling to determine the order in
which the queues are processed. The WRR queuing algorithm ensures that the lower-priority packets are not entirely
starved for bandwidth and are serviced without compromising the priority settings administered by the network
manager. Strict priority scheduling ensures that the highest-priority packets are always serviced first, ahead of all
other traffic.
In terms of rate limiting, the Cisco Catalyst 2950 Series is capable of allocating bandwidth based on several criteria,
including MAC source address, MAC destination address, IP source address, IP destination address, and TCP/UDP
port number. Bandwidth allocation is essential in network environments requiring service-level agreements (SLAs),
or when it is necessary for the network manager to control the bandwidth given to certain subscribers. The Cisco
Catalyst 2950 Series supports up to 6 policers per Fast Ethernet port and up to 60 policers on a Gigabit Ethernet
port. Traffic policing can be done in 1-Mbps increments on Fast Ethernet ports and 8-Mbps increments on Gigabit
Ethernet ports, giving the network manager very granular control of network bandwidth.
In addition, the Cisco Catalyst 2950 Series provides key voice and video service features with voice VLAN (auxiliary
VLAN) for VoIP services and hardware-based Internet Group Management Protocol (IGMP) snooping, allowing the
switch to “listen in” on the IGMP conversation between hosts and routers. When a switch hears an IGMP join
request from a host for a given multicast group, the switch adds the host port number to the Group Destination
Address (GDA) list for that group. And, when the switch hears an IGMP leave request, it removes the host port from
the list. Together with the superior QoS and rate-limiting features mentioned previously, service providers can build
a flexible network with the Cisco Catalyst 2950 Series to provide voice, video, and data services all in one network
architecture.
я нигде не нашёл примера, как это конфигурить в роутере. Например, выделяем VLAN Для порта и подключаем к порту Cisco ATA186. Необходимо выставить приоретизацию. Как это сделать?
The Cisco Catalyst 2950 Series offers superior and highly granular QoS to ensure that network traffic is classified
and prioritized, and that congestion is avoided in the best possible manner. The Cisco Catalyst 2950 Series can
classify, reclassify, police (determine if the packet is in or out of predetermined profiles and affect actions on the
packet), and mark or drop the incoming packets before the packet is placed in the shared buffer. Packet classification
allows the network elements to discriminate between various traffic flows and enforce policies based on Layer 2 and
Layer 3 QoS fields.
To implement QoS, first, the Cisco Catalyst 2950 Series switches identify traffic flows, or packet groups, and classify
or reclassify these groups using either the Differentiated Services Code Point (DSCP) field or the 802.1p
class-of-service (CoS) field, or both. Classification and reclassification can be based on criteria as specific as the
source/destination IP address, source/destination Media Access Control (MAC) address, or the Layer 4 Transmission
Control Protocol/User Datagram Protocol (TCP/UDP) port. At the ingress, the Cisco Catalyst 2950 Series can also
perform policing and marking of the packet.
After the packet goes through classification, policing, and marking, it is then assigned to the appropriate queue before
exiting the switch. The Cisco Catalyst 2950 Series supports four egress (outgoing port) queues per port, which allows
the service provider to be more discriminating and specific in assigning priorities for the various applications. At the
egress, the switch performs Weighted Round Robin (WRR) or strict priority scheduling to determine the order in
which the queues are processed. The WRR queuing algorithm ensures that the lower-priority packets are not entirely
starved for bandwidth and are serviced without compromising the priority settings administered by the network
manager. Strict priority scheduling ensures that the highest-priority packets are always serviced first, ahead of all
other traffic.
In terms of rate limiting, the Cisco Catalyst 2950 Series is capable of allocating bandwidth based on several criteria,
including MAC source address, MAC destination address, IP source address, IP destination address, and TCP/UDP
port number. Bandwidth allocation is essential in network environments requiring service-level agreements (SLAs),
or when it is necessary for the network manager to control the bandwidth given to certain subscribers. The Cisco
Catalyst 2950 Series supports up to 6 policers per Fast Ethernet port and up to 60 policers on a Gigabit Ethernet
port. Traffic policing can be done in 1-Mbps increments on Fast Ethernet ports and 8-Mbps increments on Gigabit
Ethernet ports, giving the network manager very granular control of network bandwidth.
In addition, the Cisco Catalyst 2950 Series provides key voice and video service features with voice VLAN (auxiliary
VLAN) for VoIP services and hardware-based Internet Group Management Protocol (IGMP) snooping, allowing the
switch to “listen in” on the IGMP conversation between hosts and routers. When a switch hears an IGMP join
request from a host for a given multicast group, the switch adds the host port number to the Group Destination
Address (GDA) list for that group. And, when the switch hears an IGMP leave request, it removes the host port from
the list. Together with the superior QoS and rate-limiting features mentioned previously, service providers can build
a flexible network with the Cisco Catalyst 2950 Series to provide voice, video, and data services all in one network
architecture.
я нигде не нашёл примера, как это конфигурить в роутере. Например, выделяем VLAN Для порта и подключаем к порту Cisco ATA186. Необходимо выставить приоретизацию. Как это сделать?