Institute of Telecommunications. koniec wykładu IV.

Transcription

1 koniec wykładu IV

2 MIB-2 mib-2 (1) [ ] system (1) interfaces (2) at (3) ip (4) icmp (5) tcp (6) udp (7) egp (8) transmission (10) snmp (11) tcpinerrs OBJECT- TYPE SYNTAX Counter ACCESS read-only STATUS current DESCRIPTION ::= { tcp 14 } S1 S2 S3 LA1 LA2 LA3 LP1 RA1 RP1 LP2 RA2 RP2 LP3 RA3 RP LA2.LP2.RA2.RP2 tcprtoalgorithm (1) tcpretransseg (12) tcpconntable (13) tcpconnentry (1) tcpconnstate (1) tcpconnlocaladdress (2) tcpconnlocalport(3) tcpconnremaddress (4) tcpconnremport (5) tcpinerrs (14) tcpoutrsts (15) tcpconntable OBJECT-TYPE SYNTAX SEQUENCE OF TcpConnEntry ACCESS not-accessible STATUS current DESCRIPTION ::= { tcp 13 } tcpconnentry OBJECT-TYPE SYNTAX TcpConnEntry ACCESS not-accessible STATUS current DESCRIPTION INDEX { tcpconnlocaladdress, tcpconnlocalport, tcpconnremaddress, tcpconnremport } ::= { tcpconntable 1 }...

3 SNMP SMI Structure of Management Information

4 SMI - normalizacja SMIv1 Structure and identification of management information for TCP/IP-based internets RFC , RFC Concise MIB definitions RFC Convention for defining traps for use with the SNMP RFC SMIv2 Structure of Management Information for version 2 of the Simple Network Management Protocol (SNMPv2) RFC , RFC , RFC Textual Conventions for version 2 of the Simple Network Management Protocol (SNMPv2) RFC , RFC , RFC

5 SMI typy podstawowe Application-wide INTEGER ( ) OCTET STRING(size( )) OBJECT IDENTIFIER Defined types Integer32 ::= INTEGER ( ) IpAddress ::= OCTET STRING (SIZE (4)) Counter32 ::= INTEGER ( ) Gauge32 ::= INTEGER ( ) Unsigned32 ::= INTEGER ( ) TimeTicks ::= INTEGER ( ) Opaque ::= OCTET STRING Counter64 ::= INTEGER ( )

6 SMIv2 struktura definicji MIB metka modułu (Module Identity) LAST-UPDATED UtcTime ORGANIZATION text CONTACT text DESCRIPTION text Revisions odwołania do zewnętrznych modułów (IMPORTS) definicje typów (Textual Conventions) definicje obiektów (Object Type) definicje meldunków (Notification Type)

7 RFC TEXTUAL-CONVENTION InstancePointer ::= TEXTUAL-CONVENTION STATUS obsolete DESCRIPTION "A pointer to either a specific instance of a MIB object or a conceptual row of a MIB table in the managed device. In the latter case, by convention, it is the name of the particular instance of the first accessible columnar object in the conceptual row. The two uses of this textual convention are replaced by VariablePointer and RowPointer, respectively." SYNTAX OBJECT IDENTIFIER VariablePointer ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "A pointer to a specific object instance. For example, syscontact.0 or ifinoctets.3." SYNTAX OBJECT IDENTIFIER

8 OBJECT-TYPE - sysuptime mib-2 (1) [ ] system (1) interfaces (2) at (3) ip (4) icmp (5) tcp (6) udp (7) egp (8) transmission (10) snmp (11) sysuptime OBJECT-TYPE SYNTAX Time-Ticks ACCESS read-only STATUS current (dawnej mandatory) DESCRIPTION Time since the network management portion of the system was last re-initialised. ::= {system 3}

9 OBJECT-TYPE ipnettomediatable (1) mib-2 (1) [ ] system (1) interfaces (2) at (3) ip (4) icmp (5) tcp (6) udp (7) egp (8) transmission (10) snmp (11) ipnettomediatable (22) ipnettomediaentry (1) ipnettomediaifindex (1) ipnettomediaphysaddress (2) ipnettomedianetaddress (3) ipnettomediatype (4) ipnettomediatable OBJECT-TYPE SYNTAX SEQUENCE OF IpNetToMediaEntry ACCESS not-accessible STATUS current (dawnej mandatory) DESCRIPTION "The IP Address Translation table used for mapping from IP addresses to physical addresses." ::= { ip 22 }

10 NOTIFICATION-TYPE internet (1) mgmt( 2) mib-2 (1) snmpv2(6) snmpmodules (3) snmpmib(1) linkup NOTIFICATION-TYPE OBJECTS { ifindex } STATUS current DESCRIPTION "A linkup trap signifies that the SNMPv2 entity, acting in an agent role, recognizes that one of the communication links represented in its configuration has come up." ::= { snmptraps 4 } snmpmibobjects(1) snmptraps(5) linkup(4)

11 MPLS Multi-protocol Label Switching

12 wybrane (z ponad 100) dokumenty RFC MPLS RFC3031 Multiprotocol Label Switching Architecture January 2001 RFC3032 MPLS Label Stack Encoding January 2001 sygnalizacja VPN RFC3209 RSVP-TE: Extensions to RSVP for LSP Tunnels December 2001 RFC5036 LDP Specification L. Andersson October 2012 RFC3214 LSP Modification Using CR-LDP January 2002 RFC3107 Carrying Label Information in BGP-4 May 2001 RFC4364 BGP/MPLS IP Virtual Private Networks (VPNs) February 2006 RFC4365 Applicability Statement for BGP/MPLS IP Virtual Private Networks (VPNs) February 2006 RFC2917 A Core MPLS IP VPN Architecture September 2000

13 IP forwarding -- FIB longest match prefix out prefix out IP prefix out IP IP IP IP IP IP

14 mpls forwarding prefix out prefix FEC 47.1 A 47.2 B FEC A B out 1 1 label IP in label out 1 2 label x x 1 in 3 label x IP IP IP IP MPLS MPLS MPLS

15 etykieta MPLS Ethernet, PPP ramka warstwy 2 payload L 1 L N pakiet IP label exp s TTL label [20] exp [3] - experimental (DSCPs różne opcje kodowania) s [1] - bottom of the stack TTL [8] - Time To Live

16 label merging (ii)

17 tunele MPLS (i) P 1 PE 2 P 2 PE 1 PE 3 P 3 router wewnętrzny musi utrzymywać FT entry dla każdego wirtualnego łącza (ścieżki MPLS) - słaba skalowalność jak ograniczyć liczbę wierszy? umieścić łącza w tunelach

18 tunele MPLS (ii) CE B1 CE B2 6 PE A P PE B CE A CE A1

19 konfigurowanie LSP via SNMP NMS NMS 47.1 (MIB) A

20 koniec wykładu V