The CISCO2851-SRST/K9 Cisco 2851 Voice Bundle Router includes various application optimization and performance features to ensure that the router can handle various types of network traffic and deliver high-quality voice and video communications.
One of the key features for application optimization is Quality of Service (QoS) which allows administrators to prioritize and shape network traffic to ensure that critical applications, such as voice and video, receive the necessary bandwidth and low latency. The router also supports advanced QoS features such as Class-Based Weighted Fair Queuing (CBWFQ), Low Latency Queuing (LLQ), and Weighted Random Early Detection (WRED).
Additionally, the 2851 router includes support for the Cisco IOS Firewall and Cisco IOS Intrusion Prevention System (IPS), which provide advanced security features to protect the network from various types of threats and attacks.
The router also includes support for Cisco's Express Forwarding (CEF) which is a high-performance, layer 3 switching technology that allows for efficient forwarding of packets. CEF allows the router to quickly and efficiently forward packets by maintaining a forwarding information base (FIB) which is a table that contains information about the network topology and the next hop for each destination IP address.
The CISCO2851-SRST/K9 Cisco 2851 Voice Bundle Router also includes Voice-over-IP (VoIP) features such as Voice-over-IP Media Session Peer-to-Peer (VoIP SIP P2P) and Voice-over-IP Media Gateway Control Protocol (VoIP MGCP) which provide high-quality voice and video communications.
High-Availability and Redundancy FeaturesThe CISCO2851-SRST/K9 Cisco 2851 Voice Bundle Router provides a range of high-availability and redundancy features to ensure that the network remains operational even in the event of hardware or software failures.
One of the key features is the support for Survivable Remote Site Telephony (SRST), which allows for continued operation of VoIP services in the event of a network outage. SRST allows the router to take over as the call control agent for IP phones in the event that the connection to the primary call control server is lost. This ensures that phone calls can still be made and received, even if the connection to the main office is down.
The router also supports hardware redundancy through the use of redundant power supplies and fans. In the event of a power supply or fan failure, the router will continue to operate without interruption. Additionally, the router supports Cisco's Stateful Switchover (SSO) feature, which allows for seamless failover between the router's active and standby processors in the event of a hardware failure.
In terms of software redundancy, the router supports a number of protocols such as Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP) which allows for redundancy at the network layer.
Quality of Service (QoS) for Voice TrafficThe CISCO2851-SRST/K9 Cisco 2851 Voice Bundle Router includes Quality of Service (QoS) features that are specifically designed to prioritize and manage voice traffic.
The router also supports Class-Based Weighted Fair Queuing (CBWFQ) and Low Latency Queuing (LLQ) which are the queuing mechanisms that allow for the efficient management of voice traffic. CBWFQ allows for the configuration of different queues for different types of traffic, with the ability to assign different priorities to each queue. LLQ is a variation of CBWFQ that provides strict priority queuing for voice traffic, ensuring that voice packets are always serviced before packets in other queues.
The router also includes support for a number of other QoS features such as Committed Access Rate (CAR), which allows for the configuration of rate limits for different types of traffic, and Weighted Random Early Detection (WRED), which helps to prevent network congestion by dropping lower priority packets before the queue becomes full.
General Information about this Cisco CISCO2851-SRST/K9- Manufacturer Cisco Systems, Inc
- Manufacturer Part Number CISCO2851-SRST/K9
- Brand Name Cisco
- Product Series 2800
- Product Model 2851
- Product Name 2851 Router with Voice Bundle
- Product Type Router
- Total Number of Ports 2
- USB Yes
- Management Port Yes
- Number of Network (RJ-45) Ports 2
- Number of Total Expansion Slots 11
- Expansion Slot Type NME
- Expansion Slot Type EVM
- Expansion Slot Type AIM
- Expansion Slot Type PVDM
Network & Communication
- Network Technology 10/100/1000Base-T
- Ethernet Technology Gigabit Ethernet
Management & Protocols
- Security Features-
- Multiprotocol Label Switching (MPLS) VPN support
- Secure Shell (SSH)
- Standard Memory 256 MB
- Maximum Memory 1 GB
- Memory Technology DRAM
- Flash Memory 64 MB
- Input Voltage 110 V AC
- Input Voltage 220 V AC
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