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Ethernet Link Redundancy Configuration Models
The link connections determine the configuration
model for link redundancy. The following connection types are available:
- Single-homed—Connections are between the local Ethernet
interface and a single remote device. When the peer is also configured
with LAG, LACP can be used to control link access.
- Dual-homed—Connections are between two separate,
uncoordinated remote devices. The remote interfaces can be on the
same module or on separate hardware. If LAG is not configured on the
peers, LACP cannot be used to select ports; other protocols such as
RSTP can be used.
The type of hardware used for connections further
characterizes the single-homed and dual-homed configuration models.
The following hardware types are available:
- Homogeneous—Remote interface is on another Fast
Ethernet or Gigabit Ethernet port in a back-to-back router configuration
of identical hardware and JUNOSe software versions. Both interfaces
support the same redundant cabling and algorithm. The interfaces can
be cabled on the same ports (port 0–port 0, port 1–port
1) or cross-cabled (port 0–port 1, port 1–port 0).
- Heterogeneous—Remote interface is on a different
type of hardware that might or might not support redundant cabling,
or on the same type of equipment with different software versions.
For example, a heterogeneous configuration can include an ES2-S1 GE-4
IOA and an ES2-S1 GE-8 IOA on the E320 router, or an E-series router
operating JUNOSe software connected to another vendor’s router
and software.
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Note:
You cannot configure link redundancy across different types
of line modules in a router. You also cannot configure link redundancy
across two GE-4 IOAs on the E120 router or the E320 router.
|
Figure 21 illustrates the
configuration models for Ethernet link redundancy.
Figure 21: Ethernet Link Redundancy Configuration
Models
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