The traceroute command may be invoked from user mode, whereas the extended traceroute is only available from privileged mode. This shows the routers a packet has passed through to reach its destination. The extended traceroute test is called by entering the command without any destination. This results in the utility asking a series of questions, allowing you to change the defaults
Case Study: MPLS VPN QoS Design (CE/PE/P Routers)
Continuing the example from the previous design chapters, the fictitious company ABC, Inc., has been growing and expanding, both geographically and technologically. It has multiple data centers in geographically diverse regions to which its field needs to connect efficiently. Additionally, to increase collaboration and simultaneously reduce travel expenses, ABC, Inc., plans to roll out any-to-any videoconferencing. For these business reasons, ABC, Inc., has decided to migrate..
Providing Notifications for Network Events
Whereas responding to problem reports from users is a reactive form of troubleshooting, monitoring network devices for significant events and responding to those events is a proactive form of troubleshooting. For example, before a user loses connectivity with the Internet, a router that is dual-homed to the Internet might report the event of one of its Internet connections going down. The redundant link can then be repaired, in response to the notification, thus resolving the..
The simplest way to make your routers use DSCP or TOS information is to just make sure that Weighted Fair Queuing is enabled: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#interface Serial0/0 Router(config-if)#fair-queue Router(config-if)#exit Router(config)#end Router# WFQ is enabled by default on all interfaces of E1 speeds (roughly 2 Mbps) or less. You can enable WFQ on higher speed interfaces as well, but we..
Configuring the LMI Type on a Frame Relay Interface
Cisco supports three different Local Management Interface (LMI) types for Frame Relay: Cisco, ANSI Annex D, and Q933-A Annex A. Beginning with Cisco IOS Software Release 11.2, the LMI autosense feature allows a Frame Relay interface to autodetect the LMI type supported by the directly connected Frame Relay switch. Based on the LMI status messages it receives from the Frame Relay switch, the router automatically configures its Frame Relay interface with the supported LMI type ..
