Anybody anything? /Tias
On 12/22/11 08:44 , Mathias Wolkert wrote: > Hello > > I'm running quagga 0.99.18 on debian lenny with a full bgp table from a > a rather unstable peer. From time to time I receive withdrawals for all > 380k+ prefixes and new NLRIs for them all. My session is stable, but > something happens one or a few hops upstream. > > This (obviously) causes some churn, but it seems snmpd and zebra get > stuck in a loop. Normally, adding a full feed to quagga is 10 seconds of > churn and that's it. > > If I understand it correctly, an update received by bgp is handed over > to zebra to update the kernel. As all routes in the routing table are in > the snmp-mib(.1.3.6.1.2.1.4.21), somehow that info needs to go to snmpd, > or if snmpd has some way of pointing at kernel data, I don't know... > > However after such a burst, both zebra and snmpd eat one cpu core each > and never heal. When I enable debugging in zebra, I can see a lot of > routing updates (remove prefix x, add prefix x with next hop y). > > The only thing that helps is to kill snmpd with a hammer and restart it, > and all is well again. > > I mailed this to quagga users mailing list and it was suggested that I'd > try gdb on snmpd. I did get this backtrace: > > #0 0x00007f5e5db6c960 in read () from /lib/libc.so.6 > #1 0x00007f5e5db1ab20 in _IO_file_underflow () from /lib/libc.so.6 > #2 0x00007f5e5db1c2ee in _IO_default_uflow () from /lib/libc.so.6 > #3 0x00007f5e5db107a7 in _IO_getline_info () from /lib/libc.so.6 > #4 0x00007f5e5db0f567 in fgets () from /lib/libc.so.6 > #5 0x00007f5e5e14a6b8 in ?? () from /usr/lib/libnetsnmpmibs.so.15 > #6 0x00007f5e5e14a9ba in var_ipRouteEntry () from > /usr/lib/libnetsnmpmibs.so.15 > #7 0x00007f5e5e42c3fd in netsnmp_old_api_helper () from > /usr/lib/libnetsnmphelpers.so.15 > #8 0x00007f5e5e661097 in netsnmp_call_handlers () from > /usr/lib/libnetsnmpagent.so.15 > #9 0x00007f5e5e6521d1 in handle_var_requests () from > /usr/lib/libnetsnmpagent.so.15 > #10 0x00007f5e5e653db7 in handle_pdu () from /usr/lib/libnetsnmpagent.so.15 > #11 0x00007f5e5e6562c8 in netsnmp_handle_request () from > /usr/lib/libnetsnmpagent.so.15 > #12 0x00007f5e5e656e12 in handle_snmp_packet () from > /usr/lib/libnetsnmpagent.so.15 > #13 0x00007f5e5de3cba9 in ?? () from /usr/lib/libnetsnmp.so.15 > #14 0x00007f5e5de3ed8d in _sess_read () from /usr/lib/libnetsnmp.so.15 > #15 0x00007f5e5de3f339 in snmp_sess_read () from /usr/lib/libnetsnmp.so.15 > #16 0x00007f5e5de3f38b in snmp_read () from /usr/lib/libnetsnmp.so.15 > #17 0x0000000000404cab in main () > > snmpd version 5.4.1~dfsg-12 > > Any help is much appreciated. > > > /Tias > > ------------------------------------------------------------------------------ > Write once. Port to many. > Get the SDK and tools to simplify cross-platform app development. Create > new or port existing apps to sell to consumers worldwide. Explore the > Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join > http://p.sf.net/sfu/intel-appdev > _______________________________________________ > Net-snmp-users mailing list > [email protected] > Please see the following page to unsubscribe or change other options: > https://lists.sourceforge.net/lists/listinfo/net-snmp-users ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Net-snmp-users mailing list [email protected] Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users
