Hello. Did someone start to implement LLDP/CDP support?
25.09.2013, 18:46, "Michael Brown" <[email protected]>: > On 12/09/13 11:05, Thomas Mieslinger wrote: >> [...] >> >> It would be helpful for that overview page if I could display the >> switchport right away. >> >> So for me, I'd just need PortID and PortDescr. But for other uses, I >> guess that ChassisID, SysName and SysDescr could be useful. >> >> For naming ipxe variables, I'd propose the trick to compose the name of >> a prefix and the original variable name. Example: lldp-PortDescr which >> then would be used as ${net0/lldp-PortID:uristring}. >> >> Ok, so the next step would be wait for the approval of the variable >> names and then to propose a patch. > > From a quick look at the LLDP specs, it seems as though the mapping > > ${net0.lldp/<length>.<offset>.<type>} > > might be reasonably natural, where <type> is the LLDP TLV type, and > <offset> and <length> describe the offset and length of the desired data > within the TLV value. (As a special case, a <length> of zero could > indicate "all remaining data".) > > This would allow for some fairly simple encodings of simple values, e.g. > > ${net0.lldp/4:string} for the Port Description > ${net0.lldp/5:string} for the System Name > ${net0.lldp/3:uint16} for the Time To Live > > while also allowing for access to the more complex LLDP data structures > > ${net0.lldp/1.0.1:uint8} for the Chassis ID Subtype > ${net0.lldp/1.1:hex} for the Chassis ID > > There seems to be no way to solicit LLDP information; iPXE would just > have to wait for an LLDP packet to arrive. This wait could be > implemented within an iPXE script, e.g.: > > ifopen > :lldp > isset ${net0.lldp/1} && goto lldp_done > sleep 1 > goto lldp > :lldp_done > > I'm assuming that we need to support only point-to-point LANs, and that > we can get away with receive-only operation (i.e. no need to transmit > our own LLDP information). > > Michael > _______________________________________________ > ipxe-devel mailing list > [email protected] > https://lists.ipxe.org/mailman/listinfo.cgi/ipxe-devel -- Anton D. Kachalov ITO, System Architect Tel: 7 (495) 739-70-00 ext.7613 _______________________________________________ ipxe-devel mailing list [email protected] https://lists.ipxe.org/mailman/listinfo.cgi/ipxe-devel
