For L3 Routers: 1. Checksum/CRC is validated for any packet corruption. If corrupted, packets are dropped. 2. Packets are processed only if destination MAC is same as its own interface/VLAN/port-channel MAC. Broadcast and multicast MACs are accepted when appropriate protocols are enabled. 3. Check the CAM table/route-cache for destination and applies any ingress QOS/other policy applied , if configured. 4. while packet has to egress out, TTL value is decremented and check whether decremented TTL value <= 0. If so, packet will be dropped.
HTH, Venkat http://ippoint.wordpress.com/ On Sat, Oct 30, 2010 at 10:15 PM, Taqdir Singh <[email protected]>wrote: > *Hi all:* > ** > *Could anyone please list sequence of steps which router performs whenever > any packet hits on its interface ?* > > ** > *like * > ** > *first it checks destination* > *then its check NAT* > *then its check for any policy* > *then it checks TTL* > *etc ?* > > > -- > Thanks & regards, > > Taqdir Singh > Networks | 9911709496 > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
