Re: Difference between Asymmertic VS. Symmetric routing
Asymmetric verses Symmetric just refers to the paths that data takes, round trip. With redundant design traffic flows may follow two or more paths. The packets travelling from A to B may follow a different path than packets travelling back from B to A. In most cases this is of no particular concern. In some cases a high degree of determinism may be desired.
Routing protocol metrics can be tuned to ensure that packets leaving a building block follow the same path as packets returning to the building block. For example: Packets flow from station A.1 on VLAN A through its default gateway which is Layer 3 switch X. On Layer 3 switch X the routing metric on interface VLAN A is adjusted to make this path more favorable than the alternate return path through switch Y. If OSPF is the routing protocol, the interface cost metric is adjusted. If EIGRP is the routing protocol, the interface delay metric is adjusted. And so forth.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...