[c-nsp] Bandwidth displayed on Tunnel interfaces

Jay Hennigan jay at west.net
Wed May 20 19:25:26 EDT 2009

Steve Bertrand wrote:
> Hi all,
> I've got a few protocol 41 tunnels configured on a few different
> routers, all for IPv6 only.
> Some of the tunnels are used for BGP peering with transit providers, and
> the rest join my PoPs together.
> If I understand the Cisco documentation correctly, the "BW" is used
> exclusively for link metric/cost, but it also shows up in my MRTG graphs
> and skews the percentage results.
> Since these tunnels operate on top of the same underlying connection
> type as the IPv4 infrastructure, I'd like to set the bandwidth manually
> to the same setting as the interface type the tunnel is connected over
> (or better yet, set it globally for all tunnel interfaces).
> AFAICT, doing this won't have any operational impact other than what it
> would normally have on an IGP (which is fine, because all IGP is over
> direct Ethernet), and fixing my graphing/statistical applications.
> Can I get some feedback on whether my thinking is correct? Tunnel
> bandwidth should be 100Mb:
> pe2-fibre#sh int tun5
> Tunnel5 is up, line protocol is up
>   Hardware is Tunnel
>   Description: IPv6 BGP Tunnel to he.net
>   MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
>      reliability 255/255, txload 18/255, rxload 163/255
>   Encapsulation TUNNEL, loopback not set
>   Keepalive not set
>   Tunnel source, destination
>   Tunnel protocol/transport IPv6/IP
>   Tunnel TTL 255
>   Fast tunneling enabled
>   Tunnel transmit bandwidth 8000 (kbps)
>   Tunnel receive bandwidth 8000 (kbps)


conf t
int tu5
bandwidth 100000

Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
Impulse Internet Service  -  http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV

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