June 2011
Intermediate to advanced
770 pages
23h 54m
English
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Permanent Interfaces
A permanent interface is any interface that is always present on the router (it cannot be altered). These interfaces can be management interfaces such as Ethernet, software pseudointerfaces such as tunnel interfaces, or fixed-port LAN/WAN interfaces.
On Junos routers, two management interfaces exist:
fxp0This is an Out of Band (OOB) management Ethernet interface. It is connected to the router’s Routing Engine (RE) and can be used for Out of Band management access to the router. It can also be used to send management messages such as syslog or Simple Network Management Protocol (SNMP) traps. This interface is a nontransit interface, which means that traffic cannot enter this interface and exit via a LAN/WAN interface, nor can it enter a LAN/WAN interface and exit through the management interface. On EX switches, the management interface is called the
me0interface; on all other routers, it is thefxp0interface.Note
When running routing protocols, be very careful when using the
fxp0interface. If you don’t configure the routing protocol correctly, you could have a route in your route table that points to thefxp0interface and black hole traffic, since this is a nontransit interface. To protect yourself from these types of situations, you should not run any routing protocols over this interface.fxp1This is an internal Fast Ethernet or Gigabit Ethernet (depending on the model of router) interface between the RE and the Packet Forwarding Engine (PFE). This interface ...
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