I've noticed my "core"-router is sending out IGMPv2 query packets with "Options" in the IP header (RFC2113). I can't find why this is happening nor how to disable it. I've read a lot of information how to discard packets with "Options" enabled, but not how to actually disable it if you are the source for these packets. Does anyone here has a clue?
Some more detailed information:
IOS: 15.0(2)SG (cat44500e-ENTSERVICESK9-M)
IGMP querier using IGMPv2.
PIMv2 sparse-mode activated on all vlan's requiring multicast traffic.
My actual problem:
I've got Pilz Safety PLC's connected to a couple of vlan's which want to receive data from multicast group 126.96.36.199. They don't support IGMPv2, but they do reply to an IGMPv2 query. However when the "options" field in in the IP header, they see the packet as a malformed packet (i know, that's not how they should responds according to RFC2113 but still they do..).
On another part of my network i don't have this problem. However, the "core"-router there is a 6500 with IOS 12.2.(33)SXI7. Interfaces, routing, IGMP and PIM are configured exactly the same.
I've attached two screenshots with both examples. Little note, from the screenshot showing the option field you will see two IGMP reports from the Pilz device to it's multicast group. This is correct because the device sends two IGMP reports when it's powering up. This is independent from IMGPv2 Query packets send from the router.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.