Networking Field Day 12 starts today. There are a lot of great presenters lined up. As I talk to more and more networking companies, it’s becoming obvious that simply moving packets is not the way to go now. Instead, the real sizzle is in telling you all about those packets instead. Not packet inspection but analytics.
Ask any networking professional and they’ll tell you that the systems they manage have a wealth of information. SNMP can give you monitoring data for a set of points defined in database files. Other protocols like NetFlow or sFlow can give you more granular data about a particular packet group of data flow in your network. Even more advanced projects like Intel’s Snap are building on the idea of using telemetry to collect disparate data sources and build collection methodologies to do something with them.
The concern that becomes quickly apparent is the overwhelming amount of data being received from all these sources. It reminds me a bit of this scene:
How can you drink from this firehose? Maybe you should be asking if you should instead?
Data is useless. We need to perform analysis Continue reading
I got an interesting email from Ying Lu who had read my posts on LSM:
I am curious about the Ethernet DA and codepoint used for multicast MPLS. Previously, I understand that:– Ethernet DA is unicast MAC of nexthop of each replication leg.– codepoint is 0x8847However, looking at RFC5332, I am not so sure…Quote:“Ethernet is an example of a multipoint-to-multipoint data link. Ethertype 0x8847 is used whenever a unicast ethernet frame carries an MPLS packet.
Ethertype 0x8847 is also used whenever a multicast ethernet frame carries an MPLS packet, EXCEPT for the case where the top label of the MPLS packet has been upstream-assigned.
Ethertype 0x8848, formerly known as the “MPLS multicast codepoint”, is to be used only when an MPLS packet whose top label is upstream assigned is carried in a multicast ethernet frame.
Interesting question. What is the ethernet destination address (DA) and the value of the ethernet type field (codepoint) when the MPLS packet is being sent on an LSM LSP?
Getting back into the lab, I started a ping from CE1 to a group that CE3 had joined. I then ran a sniff on the segment between P and PE3.
Examining the Continue reading
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