How to Verify Bandwidth on an LSP Using Junos
It’s important to check that your RSVP-signaled LSP has the appropriate bandwidth allocation. How can you tell that your RSVP-signaled LSP has the appropriate bandwidth allocation? If you want to look at the characteristics, you use the show rsvp interface command:
user@router1> show rsvp interface RSVP interface: 4 active Active Subscr- Static Available Reserved Highwater Interface State resv iption BW BW BW mark fe-0/0/0.0 Up 2 100% 155.52Mbps 155.52Mbps 50Mbps 0bps fe-0/0/1.0 Up 0 100% 155.52Mbps 155.52Mbps 0bps 0bps fe-1/0/1.0 Up 0 100% 155.52Mbps 155.52Mbps 0bps 0bps
In this example, router 1 has three interfaces with RSVP enabled. When you look at the reserved bandwidth on the router, you need to know what bandwidth reservation really means. If you have umpteen flows through a particular interface, what you really want to do is limit some or all of those flows to a specific piece of the overall capacity on the link.
So when you look at RSVP sessions and the bandwidth tied to them, what you’re seeing with the show rsvp interface command is the total sum of all allocated bandwidth on all the LSPs for which this router is an LSR.
The totals can be extremely helpful in ensuring that your allocated bandwidth is in line with what you want it to be. If the allocated bandwidth exceeds 100 percent, the LSPs with a reserved bandwidth specified won’t use that router as a transit router.