Thomas, >>> SNIP NLSP Adjacencies By exchanging hello packets, a router determines the reachability of its neighbors and uses this information to establish adjacency. Adjacency is a record that a router keeps about the state of its connectivity with a neighbor and the attributes of the neighboring router. The router stores these records in its adjacency database. Adjacency-establishment procedures vary depending upon whether the router is establishing and maintaining adjacencies over a WAN or a LAN. Establishing router adjacency over a WAN involves first establishing the underlying data-link connection (details depend upon the medium). The routers then exchange identities by using the IPX WAN Version 2 protocol and determine certain operational characteristics of the link. Hello packets are exchanged and the routers update their adjacency databases. The routers then exchange both link-state packets (LSPs) describing the state of their links and IPX data packets over the link. To maintain a WAN link, the router maintains a state variable indicating whether the link is up, down, or initializing for each adjacency. If the router does not hear from a neighbor within the time specified in a holding timer, the router generates a message indicating that the link is down and deletes the adjacency. WAN Hello packets enable routers to discover each other's identity, decide whether they are in the same routing area, and determine whether other routers and links are operational. A router sends Hello packets when the circuit is first established, when a timer expires, or when the contents of the next Hello to be transmitted are different than the contents of the previous Hello transmitted by this system (and one or more seconds have elapsed since the previous Hello). Hello packets are sent as long as the circuit exists. Establishing a New WAN Adjacency A typical startup procedure between two routers (A and B) on a WAN link begins with the link in the down state. Router A sends a WAN Hello indicating the down state to Router B, which changes its state for the link to Initializing. Router B sends a WAN Hello with a field indicating Initializing to Router A. Router A then changes its state for the link to initializing and sends a WAN Hello with a field indicating this to Router B. Router B changes its state for the link to the up state and sends a WAN Hello with a field indicating its new state. Finally, Router A changes its state for the link to Up. http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/nlsp.htm Regards, Phil. --- Thomas Peroutka <[EMAIL PROTECTED]> wrote: > Hi group, > > can IPXWAN be used in combination with NLSP? > I have one book saying yes and a test saying > no!?!?!? > > > -- > Viele Gr�sse/ Best regards, > Thomas > mailto:[EMAIL PROTECTED] > > > ___________________________________ > UPDATED Posting Guidelines: > http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: > http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie ___________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
