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Disaster management using lisp
 

Disaster management using lisp

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Cisco Theater presentation from Emc World 2013

Cisco Theater presentation from Emc World 2013

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  • Speaker notes:.Developer notes:.
  • Speaker notes:.Developer notes:.
  • Speaker notes:.Developer notes:.
  • FHRP IsolationThe last capability introduced by OTV is to filter FHRP (HSRP, VRRP, etc.) messages across the logical overlay. This is usually required to allow for the existence of the same default gateway in different locations and optimize the outbound traffic flows (server to client direction). This slide shows the deployment of independent default gateways in each data center site, to optimize and localize routing of outbound traffic flows.The filtering of FHRP messages across the overlay is a critical functionality to be enabled, because it allows applying the same FHRP configuration in different sites: the end result is that the same default gateway is available (i.e. characterized by the same virtual IP and virtual MAC addresses) in each data center. The main advantage is that if a host is moved between sites (for example as a consequence of vMotion), the outbound communication from the device can be established right away without requiring a refresh of the host ARP table information. Note that this mechanism control and improve the return traffic from the server to outside the world. The ingress traffic keeps going via the original DC.This assumes there is no statefull device concerned by the session.Note: OTV will provide a single command to enable the HSRP filtering functionality discussed above. However, this is not available in the first OTV software release; an alternative configuration (leveraging MAC access-control lists) can be implemented in the interim to achieve the same result