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ATM

ATM:
– performs no error checking
– has no sequence numbers
– has exactly same frame size for every packet sent (53 bytes = 48 bytes data, 5bytes header)
– may occasionally be called “cell relay”
– integrates well with other network types
– used by 80% of SP for core
– is very fast

RFC 2684, 2225 (multiprotocol encapsulation over ATM adaptation Layer 5, classical IP)
– basic encapsulation
– allows for pvcs, svcs
– allows dynamic VPI/VCI configuration
– SP uses ILMI (interim LMI) to communicate PVC information

# sample config
R5
int ATM0/1
ip address 172.16.1.1 255.255.255.0
atm pvc 56 0 115 aal5snap (Name, VPI, VCI, locally significant) 56 = unique id (i.e. R5toR6); aal5snap = classic IP

ATM is the base of MPLS development

Categories: Cisco, Routing
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