[Xorp-cvs] XORP cvs commit: xorp/etc/templates xorp/ospf xorp/xrl/interfaces xorp/xrl/targets

[Atanu Ghosh]

    Hasso> Atanu Ghosh wrote:
    >> default-metric { disable: toggle = false; metric: u32 = 0; }

    Hasso> Why "default-metric"? Metric is just one (optional) parameter
    Hasso> in this node. "default-lsa" is much better.

Agreed I have changed it.

    Hasso> And this allows to configure to originate default into
    Hasso> backbone area as well? And disable summary origination into
    Hasso> backbone area? Junos have these options available only in
    Hasso> case of nssa and stub areas - ie. nssa and stub are nodes in
    Hasso> area:

The "default-lsa" configuration only applies if the area is stub or
nssa. I tried to make this clear in the help text.

XORP# create ?
Possible completions:
  default-lsa     Originate default route in stub or not-so-stubby areas
  summaries       Generate summaries into stub or not-so-stubby areas

    Hasso> hasso@lab-junos1# show nssa { default-lsa { default-metric
    Hasso> 10; type-7; } no-summaries; }

    Hasso> [edit protocols ospf area 10.10.10.10] hasso@lab-junos1#

I looked at the Juniper stub and nssa configuration and it is difficult
for us to emulate. I haven't actually tried it but I assume that the
stub and nssa configuration blocks are mutually exclusive on a Juniper,
I don't think its possible for us to enforce that requirement in a
template file. I stayed with a single variable to select the area type
and a "default-lsa" configuration block from which values could be used
if appropriate.

    Hasso> Note, that it allows to configure type-7 default only in case
    Hasso> of nssa area as well (bugzilla #555).

Looking at RFC 3101 again it seems that the type of the default LSA is
based on the summary state. If summaries are enabled then the default
LSA is a Type-7 LSA, if summaries are disabled then the default LSA is a
Type-3 LSA. The Juniper type-7 is a backward compatibility switch to
allow a Type-3 default LSA if summaries are disabled.

The options are:
1) To use the summary state to determine that type of the LSA as
specified in RFC 3101. Thus requiring no further switches.

2) Add a type-7 variable so the type of the default LSA is user
selectable.

	Atanu.