Download Implementing Cisco IP Routing (ROUTE v2-0).actualtests.300-101.2018-10-26.1e.389q.vcex

Cisco IOS IP SLAs collects a unique subset of the following performance metrics:
Delay (both round-trip and one-way) 
Jitter (directional) 
Packet loss (directional) 
Packet sequencing (packet ordering) 
Path(per hop) 
Connectivity (directional) 
Server or website download time 
Voice quality scores

Introduction 
This document describes how to determine if internal or external Border Gateway Protocol (BGP) neighbor flaps are caused by maximum transmission unit (MTU) issues. 
Problem 
BGP neighbors form; however, at the time of prefix exchange, the BGP state drops and the logsgenerate missing BGP hello keepalives or the other peer terminates the session. 

References:

EVN reduces network virtualization configuration significantly across the entire network infrastructure with the Virtual Network Trunk. The traditional VRF-Lite solution requires creating one subinterface perVRF on all switches and routers involved in the data path, creating a lot of burden in configuration management. EVN removes the need of per VRF subinterface by using “vnet trunk” command. 
References:
http://www.cisco.com/c/en/us/products/ios-nx-os-software/easy-virtual-network-evn/index.html

Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output. 
show crypto isakmp sa—Displays the state for the ISAKMP security association (SA). 
show crypto engine connections active —Displays the total encrypts/decrypts per SA. 
show crypto ipsec sa—Displays the statistics on the active tunnels. 
show ip route—Displays the routing table. 
show ip eigrp neighbor—Displays the EIGRP neighbors. 
show ip nhrp—Displays the IP Next Hop Resolution Protocol (NHRP) cache, optionally limited to dynamic or static cache entries for a specific interface. 
show crypto socket—Displays the cryptosocket table between NHRP and IPSec. 
References:
http://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/29240-dcmvpn.html#veri

The ICMP Path Echo operation computes hop-by-hop response time between a Cisco router and any IP device on the network. 
References:
http://www.cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a00802d5efe.html

The IPv6-to-IPv6 Network Prefix Translation (NPTv6) serves as a useful mechanism for implementing address independence in an IPv6 environment. A major benefit associated with NPTv6 is the fact that it avoids the requirement for an NPTv6 Translator to rewrite the transport layer headers which reduces the load on network devices. NPTv6 also does not interfere with encryption of the full IP payload. 
References:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-16/nat-xe-16-book/iadnat-asr1k-nptv6.html

Excessive debugs to the console port of a router can cause it to hang. This is because the router automatically prioritizes console output ahead of other router functions. Hence if the router is processing a large debug outputto the console port, it may hang. Hence, if the debug output is excessive use the vty (telnet) ports or the log buffers to obtain your debugs. More information is provided below. 
References:
http://www.cisco.com/c/en/us/support/docs/dial-access/integrated-services-digital-networks-isdn-channel-associated-signaling-cas/10374-debug.html