Hi Rupesh, I suggest you first make sure DHCP works properly for the affected CPE.
debug cable mac H.H.H debug cable dhcp These should allow you to see DHCP D.O.R.A. for a CPE with MAC H.H.H The CMTS needs to use leasequery (RFC 4388) if you experienced an outage of some sort to rebuild its internal database. If leasequery option 13 is not working properly with ISC servers then you may have this problem. You could try removing "cable source verify" as a test. Hope this helps. Cheers, JF Jean-François Dubé Technicien, Opérations Réseau IP Ingénierie Exploitation des Réseaux Vidéotron "cisco-nsp" <[email protected]> a écrit sur 2014-05-24 09:17:37 : > De : Rupesh Basnet <[email protected]> > A : [email protected], > Date : 2014-05-24 09:24 > Objet : [c-nsp] Cisco CMTS and ISC DHCP Strange Issue > Envoyé par : "cisco-nsp" <[email protected]> > > Hi everyone, > > We have been using Cisco CMTS 7246 for about a decades. These days we > are facing some strange issue with CPE IP assigned by DHCP. We are using > ISC DHCP for both the modems and CPE. While I check modem searching for > the particular modem only then CPE taken is seen 0 but when I check cpe > with modem IP then I can see that customer CPE is taking IP address. > While checking on CMTS, the arp taken by CPE arp is also seen but no any > traffic are passing. If I bind the CPE mac and assign a IP then > everything gets to normal. > > CMTS is configure to relay on two DHCP services running on fail over > mode and soure verification is done for all the addresses. > > cmts2#show cable modem | in 814c > 00e0.6f70.814c 10.28.114.242 C3/1/U0 online 157 0.00 1942 *0 > * N > > cmts2#show cable modem 10.28.114.242 cpe > IP address MAC address > *10.34.16.12 9061.0c15.2535 * > > > -- > Regards, > -------- > Rupesh Basnet > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
