Displaying multicast protocols and GRE tunneling information

The following show commands display information about multicast protocols and GRE tunnels:

  • show ip pim interface
  • show ip pim nbr
  • show ip pim mcache
  • show ip pim flow
  • show statistics
  • show ip mtu
NOTE
All other show commands that are supported currently for Ethernet, VE, and IP loopback interfaces, are also supported for tunnel interfaces. To display information for a tunnel interface, specify the tunnel in the format tn num . For example, show interface tn 1. In some cases, the Ethernet port that the tunnel is using will be displayed in the format tnnum:eport .

The following shows an example output of the show ip pim interface command. 

device# show ip pim interface
Interface e1
PIM Dense: V2
TTL Threshold: 1, Enabled, DR: itself
Local Address: 10.10.10.10
Interface tn1
PIM Dense: V2
TTL Threshold: 1, Enabled, DR: 10.1.1.20 on tn1:e2
Local Address: 10.1.1.10
Neighbor:
  10.1.1.20

Syntax:show ip pim interface

The following shows an example output of the show ip pim nbr command. 

device# show ip pim nbr
Total number of neighbors: 1 on 1 ports
Port   Phy_p      Neighbor        Holdtime Age   UpTime
tn1    tn1:e2     10.1.1.20        180      60    1740

Syntax: show ip pim nbr

The following shows an example output of the show ip pim mcache command. 

device# show ip pim mcache 230.1.1.1
1    (10.10.10.1 230.1.1.1) in e1 (e1), cnt=629
     Source is directly connected
     
L3 (HW) 1: tn1:e2(VL1)
     fast=1 slow=0 pru=1 graft
     age=120s up-time=8m HW=1 L2-vidx=8191 has mll

Syntax:show ip pim mcache ip-address

The following shows an example output of the show ip pim flow command. 

device# show ip pim flow 230.1.1.1
Multicast flow (10.10.10.1 230.1.1.1):
 Vidx for source vlan forwarding: 8191 (Blackhole, no L2 clients)
 Hardware MC Entry hit on devices: 0 1 2 3
 MC Entry[0x0c008040]: 00014001 000022ee 0ffc0001 00000000
 --- MLL contents read from Device 0 ---
 MLL Data[0x018c0010]: 0021ff8d 00000083 00000000 00000000
 First  : Last:1, outlif:60043ff1 00000000, TNL:1(e2)
1 flow printed

Syntax: show ip pim flow

The following shows an example output of the show statistics command. The following statistics demonstrate an example where the encapsulated multicast traffic ingresses a tunnel endpoint on port e 2, egresses and re-ingresses as native multicast traffic on the loopback port e 4, and is then forwarded to the outbound interface e 1. 

device# show statistics
Port         In Packets          Out Packets       In Errors      Out Errors
1                     0                 1670               0               0
2                  1668                    7               0               0
3                     0                    0               0               0
4                  1668                 1668               0               0

Syntax: show statistics

The show ip mtu command can be used to see if there is space available for the ip_default_mtu_24 value in the system, or if the MTU value is already configured in the IP table. The following shows an example output of the show ip mtu command. 

device(config-tnif-10)#show ip mtu
idx   size  usage  ref-count
  0  10218      1    default
  1    800      0          1
  2    900      0          1
  3    750      0          1
  4  10194      1          1
  5  10198      0          1

Syntax:show ip mtu

Parent topic: Displaying GRE tunneling information