Network Management (SNMP)
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1 Network Management (SNMP) Raj Jain Washington University Saint Louis, MO These slides are available on-line at:
2 Overview q Network Management q SNMP q Management information base (MIB) q ASN.1 Notation q SNMPv2 q SNMPv3 19-2
3 Network Management q Management = Initialization, Monitoring, Control q Manager, Agents, and Management Information Base (MIB) Network Management Station MIB Agent Network Agent MIB Agent MIB 19-3
4 SNMP q Based on Simple Gateway Management Protocol (SGMP) RFC 1028 Nov 1987 q SNMP = Simply Not My Problem [Marshall Rose] Simple Network Management Protocol q RFC 1058, April 1988 q Only Five commands Command get-request get-next-request get-response set-request trap Meaning Fetch a value Fetch the next value (in a tree) Reply to a fetch operation Store a value An event 19-4
5 Management Information Base q MIBs follow a fixed naming and structuring convention Structure of Management Information (SMI) q These conventions were adopted from Common management Information Protocol (CMIP) designed by ISO q All names are globally unique q All nodes of the name tree are assigned numeric values by standards authorities iso.org.dod.internet.mgmt.mib.ip.ipinreceives q Tables rows are referenced by appending the index 19-5
6 MIB (Cont) q All names are specified using a subset of Abstract Syntax Notation (ASN.1) q ASN.1 specifies notation (that humans can read) and encoding (representation and ranges) q Only INTEGER, OCTET STRING, OBJECT IDENTIFIER, NULL types q Only SEQUENCE, SEQUENCE OF, CHOICE constructors 19-6
7 Global Naming Hierarchy ccitt(0) iso (1) joint-iso-ccitt (2) standard (0) iso9314 (9314) fddimib (1) org (3) dod (6) internet (1) directory (1) mgmt(2) experimental (3)private (4) system (1) interfaces (2) mib (1) fddi (8) transmission(10) fddimib (73) 19-7 fddi (15)
8 Variable Category Meaning sysuptime system Time since last reboot ifnumber interfaces # of Interfaces ifmtu interfaces MTU ipdefaultttl ip Default TTL ipinreceives ip # of datagrams received ipforwdatagrams ip # of datagrams forwarded icmpinechos icmp # of Echo requests received tcprtomin tcp Min retrans time tcpmaxconn tcp Max connections allowed 19-8
9 MIB Definition: Example ipaddrtable ::= SEQUENCE of ipaddrentry ipaddrentry ::= SEQUENCE { ipadentaddr ipaddress, ipadentifindex INTEGER, ipadentnetmask ipaddress, ipadentbcastaddr ipaddress, ipadentreasmmaxsize INTEGER ( ) } ipaddrentry {ipaddrtable 1} ipadentnetmask {ipaddrtable 3} 19-9
10 Example of Network Management Management Server (Manager) Router (Agent) Router (Agent) Router (Agent) Agent Agent 19-10
11 SNMPv1 Configuration q Manager sends request to UDP port 161. Agents send traps to UDP port
12 Role of SNMP v
13 SNMPv2 q Improved security: authentication and integrity using Data Encryption Standard (DES) q inform request Multiple manager coordination Locking mechanisms prevent multiple managers from writing at the same time q get bulk Better table handling q Confirmation option for Traps Agents can ensure that trap was received correctly. q New Error codes: nosuchname, badvalue, readonly q Reference: RFC 1441, April 1993 and more 19-13
14 SNMPv3 q Security update of SNMPv2 q Authentication: Message authentication code with a shared secret key q Privacy: Encryption using a shared secret key q Access Control: Each manager can have a different set of read/write permission for various component of MIB q Ref: RFC 2570, April 1999 and more 19-14
15 Summary q Management = Initialization, Monitoring, and Control q SNMP = Only 5 commands q Standard MIBs defined for each object q Uses ASN.1 encoding q SNMPv2 fixed issues with bulk requests and simple security q SNMPv3 added security 19-15
16 Reading Assignment q Read section 22.3 of Stallings 7 th edition q Try to answer review questions 22.6 through 22.9 and problem There is no need to submit the answers
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