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Copyright © 2011, Juniper Networks, Inc.
New Features in Junos OS Release 10.4 for M Series, MX Series, and T Series Routers
[Network Interfaces]
100-Gigabit Ethernet PIC interoperability with VLAN steering—Supports
interoperability with similar PICs from other vendors using a VLAN steering forwarding
option. Previously, the PICs required interconnection to the same model PIC.
Interoperability with interfaces from other vendors was not supported. Junos OS Release
10.4 introduces a new VLAN steering algorithm to configure 100-Gigabit Ethernet PIC
interoperation with similar interfaces from other vendors.
Two packet forwarding modes exist under the
mode, for proprietary connection of two Juniper Networks 100-Gigabit Ethernet PICs,
uses the Ethernet header SA MAC address multicast bit to steer the packets to the
appropriate PFE. VLAN steering mode allows the PIC to connect to non-Juniper
Networks equipment. On ingress, the PIC compares the outer VLAN ID against a
user-defined VLAN ID and VLAN mask combination and steers the packet accordingly.
Modifying the forwarding mode config reboots the PIC.
VLAN steering overview:
In VLAN steering mode, the SA multicast bit is not used for packet steering.
In SA multicast bit steering mode, VLAN ID and VLAN mask configuration is not used
for packet steering.
Configuration of packet forwarding mode and VLAN steering mode uses CLI
commands that result in a PIC reboot.
There are three tag types for ingress packets:
Untagged ingress packet–The packet is sent to PFE1.
Ingress packet with one VLAN–The packet forwards based on the VLAN ID.
Ingress packet with two VLANs–The packet forwards based on the outer VLAN
ID.
VLAN rules describe how the router forwards packets. For VLAN steering, you must
use one of the two rules available in the CLI:
Odd-even rule–Odd number VLAN IDs go to PFE1; even number VLAN IDs go to
PFE0.
High-low rule–1 through 2047 VLAN IDs go to PFE0; 2048 through 4096 VLAN
IDs go to PFE1.
When configured in VLAN steering mode, the PIC can be configured in two physical
interface mode or in aggregated Ethernet (AE) mode:
Two physical interface mode–When the PIC is in two physical interface mode, it
creates physical interfaces et-x/0/0:0 and et-x/0/0:1. Each physical interface can
configure its own logical interface and VLAN. CLI enforces the following restrictions
on commit:
The VLAN ID configuration must comply with the selected VLAN rule.
statement. SA multicast
forwarding-mode
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