Hi Shankar,
But what should be the correct behaviour when a "narrow-only" router
receives TLV135?
Even more unclear is that, not only did the "narrow-only" router listened
to TLV135, the metrics of TLV128 are incremented by 64 than than the
metrics of TLV135, as below:
R2>sh isis data detail
IS-IS Level-1 Link State Database
LSPID LSP Seq Num LSP Checksum LSP Holdtime
ATT/P/OL
R1.00-00 0x00037A52 0x3502 331 1/0/0
Area Address: 47.0002
NLPID: 0xCC
Router ID: 10.0.56.4
IP Address: 10.0.56.4
Hostname: R1
Metric: 2 IS R2.00
Metric: 2 IS-Extended R2.00
Metric: 0 IP 10.0.56.4 255.255.255.255
Metric: 2 IP 10.0.56.76 255.255.255.252
Metric: 2 IP 10.0.56.80 255.255.255.252
Metric: 68 IP 10.0.56.32 255.255.255.252
Metric: 70 IP 10.0.56.36 255.255.255.252
Metric: 80 IP 10.0.56.56 255.255.255.252
Metric: 80 IP 10.1.1.0 255.255.255.0
Metric: 0 IP 10.0.56.4/32
Metric: 2 IP 10.0.56.76/30
Metric: 2 IP 10.0.56.80/30
Metric: 4 IP-Interarea 10.0.56.32/30
Metric: 6 IP-Interarea 10.0.56.36/30
Metric: 16 IP-Interarea 10.0.56.56/30
Metric: 16 IP-Interarea 10.1.1.0/24
Thanks.
J.B.
On Thu, 7 Jun 2001, Shankar Vemulapalli wrote:
> J.B.:
>
>
> The default behavior is to generate narrow metrics.
> In this mode the router will accept and generate only narrow-style
> metrics - (TLV 128).
>
> You can configure a router to generate wide-style metrics.
> In this mode the router will accept and generate only wide-style
> metrics - (TLV 135).
>
> When you have routers in your network which can understand either
> narrow-only or wide-only, to interoperate between them - you can
> configure the router(s) for 'transition' mode.
>
> In this mode based on whether it is 'narrow transition' or
> 'wide transition', the router will accept narrow and wide and generate
> narrow only or vice versa.
>
> The 'transition' mode is recommended to be used only during the
> transition phase of the routers from narrow to wide.
>
> You can look at the 'show clns protocol' command to figure out what
> kind of ISIS metric style that the router is generating/accepting.
>
> Hope it helps,
>
>
>
> /Shankar
>
> ! Date: Thu, 7 Jun 2001 03:28:56 -0400
> ! From: j.belcina@computer.org
> ! Subject: Narrow/Wide ISIS metrics
> !
> !
> ! Does anyone know what's the behaviour of a Cisco router,
> ! set to default (generate narrow metrics only), when it receives both types
> ! of TLVs for the same prefix?
> !
> ! Thanks.
> ! J.B.
> !
> !
>
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