ET> It's not that bad comparing to IPoE model. At least you got PPP keepalives, so it won't take a long time for a CPE to re-establish internet connectivity through terminating existing session and creating a new one. As I recall, In IPoE scenario CPE will keep existing session up for 75% of dhcp lease time configured which could take some time unless your CPE supports ARP ping. Anybody knows if Juniper MX/E support this feature?
CB> DHCP leases can be quite short still, 5 min or less if your router/DHCP server can support it. Some BNGs can also split-lease DHCP (not sure if Juniper can do this, anybody?) where the BNG maintains a short lease with the client but only relays a long lease (1 day etc) to the main DHCP server reducing the resource requirements of the servers. ET> Nice feature. As far as I understand you can't achieve load sharing using it, right? You've got single master for existing VRRP group and master handles PADO replies, so when backup BNG takes over it would consider *every* session unknown. Is my understanding correct? CB> Yes when the backup BNG takes over it does consider every session unknown and sends a PADT to kill the session immediately on the CPE so it is quite fast to failover. You can also achieve load balancing by running multiple VRRP groups on each interface and tying some subinterfaces/vlan/vlan-ranges to each group. ET> Since we're using the juniper mail list it's worth mentioning the Virtual-chassis feature of JUNOS which is kinda nice I believe (didn't use it though). CB> I agree with you that Juniper VC on the MX is a fantastic feature and the stateful session failover is great but I would still like to see a last-line-of-defence in case a software bug or ISSU failure brings down the entire VC in one hit. -- This transmission or any part of it is intended solely for the named addressee. It is confidential. The copying or distribution of this transmission or any information it contains, by anyone other than the addressee, is prohibited. CommTel Network Solutions cannot be held accountable for any comments, statements or attachments. If you have received this transmission in error, please phone +61 3 8340 6100 or by reply e-mail to the sender. If you are not the named addressee, you must destroy the original transmission and its contents. You may not rely on electronically transmitted material unless requested that the transmission is subsequently confirmed by fax or letter. Material transmitted to you should also be checked by reference to a hard copy of that material printed directly from our word processing system. Message protected by MailGuard: e-mail anti-virus, anti-spam and content filtering.http://www.mailguard.com.au/mg _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
