Output of "show cef vrf <vrf name> <network> detail" command

[RGvanWierst]

Hi All,

Below is shown an example output of the "show cef vrf <vrf-name> <network> detail" command.

I am curious for the meaning of some of the details in this output.

The command has been executed in an isolated testnetwork and the IP-addresses shown are in the private range.

The used <vrf-name> = 08-gsmr

The used <network> = 10.82.46.0/24

The questions I have in particular regarding the below output are:

• What is the meaning of the acronym LW-LDI ?
• What is the meaning of LDI update time ?
• What is the meaning of 0 in 22064/0/21 ?
• What is the meaning of 21 in 22064/0/21 ?

show cef vrf 08-gsmr 10.82.46.0/24 detail
Wed Oct 6 09:43:14.576 CEST
10.82.46.0/24, version 382, internal 0x5000001 0x0 (ptr 0x78567394) [1], 0x0 (0x0), 0x208 (0x78b769a8)
 Updated Sep 29 14:30:39.986
 Prefix Len 24, traffic index 0, precedence n/a, priority 3
  gateway array (0x782e3590) reference count 13, flags 0x2038, source rib (7), 0 backups
                        [1 type 1 flags 0x48441 (0x78bbe7a8) ext 0x0 (0x0)]
  LW-LDI[type=0, refc=0, ptr=0x0, sh-ldi=0x0]
  gateway array update type-time 1 May 4 15:39:58.248
 LDI Update time May 4 15:39:58.248
    via 10.71.94.64/32, 9 dependencies, recursive [flags 0x6000]
       path-idx 0 NHID 0x0 [0x78ca78b8 0x0]
       recursion-via-/32
       next hop VRF - 'default', table - 0xe0000000
       next hop 10.71.94.64/32 via 22064/0/21
         next hop 10.71.95.46/32 Hu0/0/0/0 labels imposed {22064 24047}
         next hop 10.71.95.96/32 Hu0/0/0/1 labels imposed {22064 24047}

         Load distribution: 0 (refcount 1)

         Hash   OK      Interface        Address
         0        Y         Unknown       22064/0

Looking forward to your answers.

Thanks in advance for that.

Best regards,

Bob.

[Giuseppe Larosa]

Hello @RGvanWierst ,

what version of IOS XR is running on your ASR 9000 ?

this could help to find the right command reference to look at

• What is the meaning of the acronym LW-LDI ?
• What is the meaning of LDI update time ?
• What is the meaning of 0 in 22064/0/21 ?
• What is the meaning of 21 in 22064/0/21 ?

LDI could be Label Database Infrastructure   LW-LDI might indicate the global label space node wide

>> type=0, refc=0, ptr=0x0, sh-ldi=0x0

type 0 should mean node wide label space

next hop 10.71.95.46/32 Hu0/0/0/0 labels imposed {22064 24047}
         next hop 10.71.95.96/32 Hu0/0/0/1 labels imposed {22064 24047}

I would say 22064 is the IGP label and 24047 the VPN label

Hope to help

Giuseppe

[RGvanWierst]

Hi Giuseppe,

thank you for taking the effort to reply to some of my questions.

Regarding your question, it is IOS-XR version 7.1.3.

With your answer of global label space I have found a few documents discussing this (platform wide and system wide). Studying these docs may lead to better understanding of segment routing.

The other answer "I would say 22064 is the IGP label and 24047 the VPN label" is very interesting and opens the way to a new perspective on the meaning of these labels which I will investigate thoroughly.

Now that the first two bullets in the list have been solved, more or less (I will use your leads to dive deeper into SR), there are still two bullets remaining:

• What is the meaning of 0 in 22064/0/21 ?
• What is the meaning of 21 in 22064/0/21 ?

I am very curious about the meaning of these numbers and hope someone can enlighten me.

Thanks again, Giuseppe.

Best Regards,
Bob.