Step 3: Verify RSVP Neighbors

Purpose

Display a list of RSVP neighbors that were learned dynamically when exchanging RSVP packets. Once a neighbor is learned, it is never removed from the list of RSVP neighbors unless the RSVP configuration is removed from the router.

Action

To verify RSVP neighbors, enter the following command from the ingress, transit, and egress routers:

user@host> show rsvp neighbor

Sample Output 1

user@R1> show rsvp neighbor 

RSVP neighbor: 1 learned

Address            Idle Up/Dn LastChange HelloInt HelloTx/Rx MsgRcvd

10.1.13.2            10  1/0        9:22        9    64/64   32

user@R3> show rsvp neighbor 

RSVP neighbor: 2 learned

Address            Idle Up/Dn LastChange HelloInt HelloTx/Rx MsgRcvd

10.1.13.1             0  1/0       28:20        9   190/190  41

10.1.36.2         16:50  1/1       15:37        9   105/78   38

user@R6> show rsvp neighbor 

RSVP neighbor: 1 learned

Address            Idle Up/Dn LastChange HelloInt HelloTx/Rx MsgRcvd

10.1.36.1         17:30  1/1       16:15        9   104/78   39

Sample Output 2

user@R3> show rsvp neighbor 

RSVP neighbor: 2 learned

Address            Idle Up/Dn LastChange HelloInt HelloTx/Rx MsgRcvd

10.1.13.1             5  1/0        9:14        9    63/63   33

10.1.36.2             5  1/0        9:05        9    62/62   32

user@R6> show rsvp neighbor 

RSVP neighbor: 1 learned

Address            Idle Up/Dn LastChange HelloInt HelloTx/Rx MsgRcvd

10.1.36.1             5  1/0        8:54        9    61/61   32

What It Means

Sample Output 1 shows that R1 and R6 have one RSVP neighbor each, R3. However, the values in the Up/Dn field are different. R1 has a value of 1/0 and R6 has a value of 1/1, indicating that R1 is an active neighbor with R3, but R6 is not. When the up count is one more than the down count, the neighbor is active; if the values are equal, the neighbor is down. The values for R6 are equal, 1/1, indicating that the neighbor R3 is down.

Transit router R3 knows about two neighbors, R1 and R6. The Up/Dn field indicates that R1 is an active neighbor and R6 is down. At this point it is not possible to determine if the problem resides with R3 or R6, because both neighbors are not active. Continue investigating the problem in Verify RSVP Interfaces.

In contrast to Sample Output 1 and to illustrate correct output, Sample Output 2 shows the correct neighbor relationship between transit router R3 and egress router R6. The Up/Dn field shows the up count to be one more than the down count, 1/0, indicating that the neighbors are active.