Configuring 4-Port OC192 PIC to Operate in OC768-over-OC192 Mode
In the 4-port OC192 PIC with OC768-over-OC192 mode, four OC192 links are aggregated into one OC768 link with one logical interface. This single interface achieves data rates of approximately 40 Gbps. OC768 optics are expensive, and most long-distance networks currently use fiber optics and regenerators that cannot carry OC768 SONET. When you create an OC768 pipe as a large data pipe running over existing infrastructures, you transfer network traffic without link bonding or load sharing over parallel links. Load sharing is automatically accomplished in the Junos OS using a proprietary method, and does not need to be manually configured.
The following limitations apply to OC768-over-OC192 mode:
The maximum difference in delay between all links in the bundle is 8 µ (microseconds), equivalent to approximately 1.5 km maximum difference in length between the longest and shortest fiber pairs.
If a single link in the bundle fails, the whole bundle fails. If link redundancy is required, implement an aggregated SONET/SDH bundle instead.
Only routers that contain 4-port OC192 PICs can operate in OC768-over-OC192 mode.
To configure the 4-port OC192 PIC to operate in OC768-over-OC192 mode:
- In the configuration mode go to the [edit chassis] hierarchy level.user@host# edit chassis
- Configure the aggregate-ports.
On standalone T640, T1600, and T4000 routers, include the aggregate-ports statement at the [edit chassis fpc slot-number pic pic-number] hierarchy level.[edit chassis]user@host# edit fpc slot-number pic pic-numberuser@host# set aggregate-ports
On TX Matrix and TX Matrix Plus router, configure the aggregate-ports statement at the [edit chassis lcc lcc-number fpc slot-number pic pic-number] hierarchy level.[edit chassis]user@host# edit lcc lcc-number fpc slot-number pic pic-numberuser@host# set aggregate-ports
- To verify the configuration, execute the show interfaces
so-fpc/pic/port extensive operational command. When this command is used for
the 4-port OC192 PIC configured for OC768-over-OC192 mode, only port
0 (so-fpc/pic/0) is displayed. This port is displayed as OC768.
When you configure the 4-port OC192 PIC for OC768-over-OC192 mode, only port 0 (the first port) needs be configured as the OC768 port.