TE was the main driver and reason for MPLS invention. To utilize bandwidth of unused links, to have flexibility in path selection just like previous WAN switching technologies. To create Virtual circuits on top of IP networks. IP Routing is performed hop by hop and you can not dictate a policy to other hops. TE [...]
Archive for the ‘Quality of Service’ Category
20 Dec
Why WAN Acceleration?
It’s not a long time that Cisco has introduced its WAAS solution, which stands for Wide Area Application Services, It plays with TCP window size, and using labels for minimizing duplicate/redundant data inside IP packets acting like a compression mechanism. WAN Acceleration is all about TCP applications, on a basic TCP setup between a server and [...]
8 Feb
CCIE LAB – QOS Tricks
Cisco Routers generate and send out the TCP telnet traffic with TOS of 6. We can change this value by the following command: Router(config)# ip telnet tos x so what’s the purpose of trick… well, It’s a handy method for debugging QoS tasks, generating traffic with different TOS is not a bad idea. To [...]
8 Feb
CCIE LAB – Catalyst QOS
The very first step of configuring Quality of Service for Cisco Catalyst switches is mls qos global configuration command: Switch(config)# mls qos Enabling VLAN-based QOS on trunk interfaces by: Switch(config-if)# mls qos vlan-based The picture depicts QoS Classification Bits in Frames and Packets: Switch(config-if)# mls qos trust dscp/cosCOS is Class of Services [...]
6 Feb
CCIE LAB – Random Detect
Global Synchronization problem: TCP has sliding windows mechanism for flow control, when there’s enough bandwidth, TCP window gets stretch, so less acknowledgment will be required and more bulk of data can be transferred with fewer stop and checks… more data transfer, less delay. When bandwidth is congested, TCP can not receive ACK from the remote [...]
2 Feb
CCIE LAB – Quality of Service
Queue is only outbound, to exit to TxR ring (Hardware Queue) Data > Tail – Output Queue (buffer) – Head > TxR Bandwidth Guarantee: Guarantees the minimum amount of bandwidth during congestion periods for a particular application or host(s), in bits-per-seconds or a ratio % (percent) MQC: Bandwidth Legacy: CQ Priority Guarantee: Prioritizes [...]
2 Feb
CCIE LAB – Frame Relay Traffic Shaping
Definitions: Purpose of Frame-Relay Traffic Shaping is to transmit at the speed which is acceptable by provider at the same time do not overrun a remote site. It simply delays the packets… Available Rate (AR) is the rate of interface (like DCE clock rate) Committed Information Rate (CIR) is the configured speed on router [...]
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