Port Features
Page 42 7750 SR Interface Configuration Guide
The behavior of Port State and Operational State are different for a port with link protocols
configured (Eth OAM, Eth CFM or LACP for ethernet ports, LCP for PPP/POS ports). A port with
link protocols configured will only transition to the Up Port State when the physical link is up and
all the configured protocols are up. A port with no link protocols configured will transition from
Down to Link Up and then to Up immediately once the physical link layer is up.
The SR OS linkDown and linkUp log events (events 2004 and 2005 in the SNMP application
group) are associated with transitions of the port Operational State. Note that these events map to
the RFC 2863, The Interfaces Group MIB
, (which obsoletes RFC 2233, The Interfaces Group MIB
using SMIv2) linkDown and linkUp traps as mentioned in the SNMPv2-MIB.
An Operational State of Up indicates that the port is ready to transmit service traffic (the port is
physically up and any configured link protocols are up). The relationship between port Operational
State and Port State in SR OS is shown in Table 6:
Table 6: Relationship of Port State and Oper State
Operational State (Oper State or Oper Status)
(as displayed in “show port x/y/z”)
Port State (as displayed in
the show port summary)
For ports that have no link
layer protocols configured
For ports that have link layer
protocols configured
(PPP, LACP, 802.3ah EFM,
802.1ag Eth-CFM)
Up Up Up
Link Up (indicates the
physical link is ready)
Up Down
Down Down Down
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