Problem solving Model
Define the problem
Gather the facts
Consider the possibilities
Create an action plane
Implement the action plan
Observe the result
Repeat the problem solving process
Resolve the problem
show buffers:
hits: succesful attempts to allocate a buffer
misses: allocation attempts the results in alloacting new buffer (must be low)
trims: buffer released becouse not used
show controller cxbus:
shows the allocation of the buffers at router startup
show controller [interface]: display memory management and error countersfor interfaces
internal controller counts
show memory [free]:
IO memory free: should be great
show processes: to find process that require a lot of cpu
runtime: cpu time the process has used
invoked: number of time the process has been invoked
usecs: cpu time for each process invocation
show process memory: to find the memory allocated from each process
show stacks: snapshot of the stacks
(confg)# exception dump: force creation af a core dump when the next crash occurs
DEBUG TCP/IP
ping
trace
show ip access-list
show ip arp
show ip interface [brief]
show ip ospf database
show ip ospf interface
show ip protocols
show ip route [summary]
show ip traffic
debug ip eigrp
debug ip icmp
debug ip ospf events
debug ip packet
debug ip rip
debug arp
DEBUG NETWARE
ping ipx
show ipx eigrp topology
show ipx interface
show ipx nlsp database
show ipx route
show ipx servers
show ipx traffic
debug ipx ipxwan (ipx on wan interface)
debug ipx packet
debug ipx routing
debug ipx sap
SAP: Service Advertising Protocol to broadcast and discover network services
NCP: Network Core Protocol connection oriented protocl alternative to spx (layer 5,6)
IPX/SPX
DEBUG APPLETALK
show appletalk acsess-list
show appletalk adjacent-routes (network directly connected)
show appletalk arp
show appletalk global (appletalk router information)
show appletalk interface
show appletalk name-cache
show appletalk route
show appletalk traffic
show appletalk nbp
show appletalk zone
debug apple arp
debug apple errors
debug apple events
debug apple nbp
debug apple packet
debug apple routing (RTMP output)
debug apple zip
NBP: Name Binding Protocol (layer 4)
RTMP: Routing Table Maintenance Protocol (layer 4)
ZIP: Zone Information Protocol (layer 5)
DDP: Datagram Delivery Protocol (layer 3)
ATP: AppleTalk Transfer Protocol (layer 4)
AEP: AppleTalk Echo Protocol (layer 4)
ADSP: AppleTalk Data Stream Protcol (layer 5)
DEBUG SWITCHING
show system
show test
show interface
show log
show mac
show module
show port
show config
show span
show trunk
show spantree [vlan][statistics]
show vtp domain
show vlan
debug vlan packet
debug span
SPAN: mirror flow data from a port to another to the designated span port
VTP: Vlan Trunking Protocol, layer 2 multicast messaging protocol that allows vlan classification
DEBUG FRAME RELAY
show frame-relay lmi: lmi statistics
show frame-relay map: check dlci to layer 3 map and info about connections
show frame-relay pvc: lmi status of each dlci
debug serial interface
debug frame-relay lmi
debug frame-relay events
debug frame-relay packet
LMI: Local Management Interface (Cisco, Ansi, ITU q933a)
FECN: Forward Explicit Congestion Notification
BECN: Backward Explicit Congestion Notification
DE: Discard Eligibility
DEBUG ISDN
show interface bri
show controllers bri
show isdn status
show dialer
show ppp multilink
debug bri
debug isdn q921
debug isdn q321
debug ppp authentication
debug ppp negotiation
debug dialer
TE1---------S--NT2--T--NT1--U--LE
TE2--R--TA--+
