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Webcast-Catalyst9k
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[ospfv3] auto-cost calculation

Dear CSC:

 

My question is regarding how OSPFv3 calculates auto-cost. I'm using:

 

 auto-cost reference-bandwidth 100000

 

I see the following costs on two particular interfaces:

 

RP/0/RSP0/CPU0:XXXXXXXX#show ospfv3 inter brie              
Tue Aug  5 10:37:19.582 CST

Interface    PID        Area            IPv6 Address               Cost  State Nbrs F/C

Lo0          ipv6       0               fe80::xxxxxxx:544b         1     LOOP  0/0
BE1          ipv6       0               fe80::xxxxxxx:d5b          10    P2P   1/1
BE2          ipv6       0               fe80::xxxxxxxx:d5a         1     P2P   1/1

 

The thing is both bundles are configured exactly the same, down to the number of interfaces.

 

RP/0/RSP0/CPU0:xxxxxxxxx#show int bundle-ether 1
Tue Aug  5 10:39:13.124 CST
Bundle-Ether1 is up, line protocol is up 
  Interface state transitions: 3
  Hardware is Aggregated Ethernet interface(s), address is 0026.982c.0d5b
  Description: 
  Internet address is x.x.x.x/30
  MTU 9216 bytes, BW 80000000 Kbit (Max: 80000000 Kbit)
     reliability 255/255, txload 1/255, rxload 23/255
  Encapsulation ARPA,
  Full-duplex, 80000Mb/s
  loopback not set,
  ARP type ARPA, ARP timeout 04:00:00
    No. of members in this bundle: 8
      TenGigE0/4/0/0               Full-duplex  10000Mb/s    Active          
      TenGigE0/4/0/1               Full-duplex  10000Mb/s    Active          
      TenGigE0/4/0/2               Full-duplex  10000Mb/s    Active          
      TenGigE0/4/0/3               Full-duplex  10000Mb/s    Active          
      TenGigE0/4/0/4               Full-duplex  10000Mb/s    Active          
      TenGigE0/4/0/5               Full-duplex  10000Mb/s    Active          
      TenGigE0/4/0/6               Full-duplex  10000Mb/s    Active          
      TenGigE0/4/0/7               Full-duplex  10000Mb/s    Active 

------

 

 

RP/0/RSP0/CPU0:xxxxxxxxxx#show int bundle-ether 2
Tue Aug  5 10:40:14.732 CST
Bundle-Ether2 is up, line protocol is up 
  Interface state transitions: 1
  Hardware is Aggregated Ethernet interface(s), address is 0026.982c.0d5a
  Description: 
  Internet address is x.x.x.x/30
  MTU 9216 bytes, BW 80000000 Kbit (Max: 80000000 Kbit)
     reliability 255/255, txload 6/255, rxload 10/255
  Encapsulation ARPA,
  Full-duplex, 80000Mb/s
  loopback not set,
  ARP type ARPA, ARP timeout 04:00:00
    No. of members in this bundle: 8
      TenGigE0/7/0/0               Full-duplex  10000Mb/s    Active          
      TenGigE0/7/0/1               Full-duplex  10000Mb/s    Active          
      TenGigE0/7/0/2               Full-duplex  10000Mb/s    Active          
      TenGigE0/7/0/3               Full-duplex  10000Mb/s    Active          
      TenGigE0/7/0/4               Full-duplex  10000Mb/s    Active          
      TenGigE0/7/0/5               Full-duplex  10000Mb/s    Active          
      TenGigE0/7/0/6               Full-duplex  10000Mb/s    Active          
      TenGigE0/7/0/7               Full-duplex  10000Mb/s    Active  

 

My configuration is the following:

 

router ospfv3 ipv6
 graceful-restart
 router-id x.x.x.x
 auto-cost reference-bandwidth 100000
 area 0
  interface Loopback0
  !
  interface Bundle-Ether1
   authentication ipsec spi 300 md5 password 00021507055E0E555E75191C514E534E420D0A052B2E217B626177415F41555806
   network point-to-point
  !
  interface Bundle-Ether2
   authentication ipsec spi 300 md5 password 00021507055E0E555E75191C514E534E420D0A052B2E217B626177415F41555806
   network point-to-point

[snip]

 

Can anyone shed some light as to what to look for to see why I get a cost of '1' in one bundle and '10' in the other?

 

Regards,

c.

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