CCN. CCNx 1.0 Changes from 0.x. Computer Science Laboratory Networking & Distributed Systems IETF 90 - July 2014
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1 CCN CCNx 1.0 Changes from 0.x Computer Science Laboratory Networking & Distributed Systems IETF 90 - July 2014
2 CCNx changes from 0.x Static header, optional header, message TLV packet format (vs ccnb) Validation algo (vs Signature) Exact-match (no prefix match, selectors) Restrictions (vs selectors/names) Hop-limit (no nonces) Payload in interest (vs long names) Label-based names (no command markers) 2
3 Changes - details 3
4 Packet Format CCN 0.x CCN 1.x Static Header Optional Headers Message Message 4
5 Packet Format - Why change Static header enables fast parsing contains common needs allows versioning Optional headers allows network elements to add/modify information 5
6 Packet Encoding CCN 0.x CCN 1.x ccnb Custom binary encoding format for XML to meet specific needs of CCNx <block><block><block> tlv type-length-value (tag-length-value) 2 byte T 2 byte L L byte V 6
7 Packet Encoding - Why change ccnb tlv flexible but complicated relies on meta-structure bit efficient easy to parse well understood parse efficient 7
8 Message Organization CCN 0.x CCN 1.x Content Object Content Object / Content Object Interest Signature Name Signed Info + Meta Payload Name Meta Payload Validation 8
9 Message Organization - Why change Name comes first fast parsing Separate validation from metadata at the end modular security Unified packet format simplified, fast parsing 9
10 Matching (exact) CCN 0.x CCN 1.x /parc/ccn.zip /parc/ccn.zip /parc/ccn.zip/v2/s3 /parc/ccn.zip/v2/s4 /parc/ccn.zip /parc/ccn.zip/v7/s6 /parc/ccn.zip/v100/s1 /parc/ccn.zip/meta/v1/s8 /parc/ccn.zip/discussion /parc/ccn.zip/.acl/by_group/owner/key/v1/s9 10
11 Matching (no selectors) CCN 0.x CCN 1.x Interest: name = /parc/ccn.zip minsuffixcomponents=x maxsuffixcomponents=y exclude=xxx,xxx,xxx, childselector=left/right Interest: name = /parc/ccn.zip 11
12 Matching - Why change Exact match is deterministic You get what you ask for Efficient match Fast forwarding on single match No rummaging of caches / traffic Better privacy 12
13 Matching (restrictions) CCN 0.x CCN 1.x Interest: name = /parc/ccn.zip pubkeydigest=xxx Interest: name = /parc/ccn.zip keyidrestriction=xxx Interest: name = /parc/ccn.zip/abcd minsuffixcomponents=0 maxsuffixcomponents=0 Interest: name = /parc/ccn.zip contentobjecthash=abcd 13
14 Matching (restrictions) - Why change No real change Functionally the same Explicit contentobjecthash matching Simpler matching (not intermingled) 14
15 Loop halting CCN 0.x CCN 1.x Interest: name = /parc/ccn.zip nonce = 1234 PIT /parc/ccn.zip : 1234 Interest: name = /parc/ccn.zip hop-limit = 16 PIT /parc/ccn.zip 15
16 Loop halting - Why change Less overhead No need to carry large nonce in packet No need to keep nonces at router (large at fast speed) PIT takes care of most loops PIT halts loops, hop-limit is a stop-gap Nonces breaks aggregation Interests can t be aggregated (if node can treat same nonce interests as equal) 16
17 Interest Payload CCN 0.x CCN 1.x Interest: name = /store/cart/abc defg <1k component> xyz/checkout Interest: name = /store/cart/ id=1234/checkout payload = abc defg <1k component> xyz 17
18 Interest Payload - Why change Less processing at routers No need to parse long names all the time Less storage at routers No need to keep large names at routers Less traffic overhead No need to carry copy of state back in the response 18
19 Label-based names CCN 0.x CCN 1.x /parc/ccn.zip/ %C1.M.K%01%02 / %FD%04%62 / %00%02/ /parc/ccn.zip/ app<key>=1234/ v=12/ c=2/ 19
20 Label-based names - Why change No aliasing Defining structure eliminates aliasing Cleaner representation More human readable More powerful Structure allows network elements to make choices 20
21 Summary Static header, optional header, message TLV packet format (vs ccnb) Validation algo (vs Signature) Exact-match (no prefix match, selectors) Restrictions (vs selectors/names) Hop-limit (no nonces) Payload in interest (vs long names) Label-based names (no command markers) 21
22 Other changes - Summary 1 Fragmentation Signature verification Manifest as core object Time is now in milliseconds No AnswerOriginKind, Scope Control messages Reduced timers Next hop (vs Face) 22
23 Other changes - Summary 2 Storage (vs Repo) Separate discovery, chunk, versioning Sync as protocol+service Content Store is optional Content Store has matching requirements Flow control (vs static pipelining) 23
24 Other changes - Summary 3 Software (all C) Coding style Modular transport Modular API Test driven 24
25 Thank you Nacho (Ignacio) Solis
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