From: Renaud MAURICE (rmaurice@xxxxxxxxx)
Date: Fri May 17 2002 - 04:44:47 GMT-3
Jason and all,
I though that when you turn on debug, it automatically disable route cache,
am I wrong?
Cheers,
Renaud
>>-----Original Message-----
>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>>Jason Sinclair
>>Sent: jeudi 16 mai 2002 03:48
>>To: 'Tom Young'
>>Cc: 'ccielab@groupstudy.com'
>>Subject: RE: some command
>>
>>
>>Tom,
>>
>>Basically the directed-broadcast command has more relevance in
>>switching it
>>on so that the router will pass the directed broadcast packets. You are
>>correct in stating that a router will not normally propagate broadcasts,
>>however you may want to modify this behaviour.
>>
>>With regards to mroute/route-cache this is useful to turn off for
>>debugging
>>as commands such as debug ip packet do not show you switched packets that
>>use the route-cache for exit interface info. It only shows
>>packets that are
>>passed to the processor, hence by leaving it on you may miss
>>packets in the
>>debug. By turning it off you ensure that you see all packets that are
>>processed.
>>
>>Regards,
>>
>>Jason Sinclair CCIE #9100
>>Manager, Network Control Centre
>>POWERTEL
>>Ground Level, 55 Clarence Street,
>>SYDNEY NSW 2000
>>AUSTRALIA
>>office: + 61 2 8264 3820
>>mobile: + 61 416 105 858
>>* sinclairj@powertel.com.au
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: Tom Young [mailto:gitsyoung@yahoo.co.jp]
>> Sent: Thursday, 16 May 2002 11:33
>> To: Jason Sinclair
>> Subject: RE: some command
>>
>> Jason:
>> Thank you for your reply, I understood the two command
>> now.
>> But I still don't know their function, for example,
>> route couldn't forward any broadcast, it is the rule of
>> router, so I think the router couldn't forward the
>> 192.168.1.255,basicly. So, the no ip directed-broadcast is
>> meanless.
>> And the mroute-cache, if the router don't cache the
>> unicast route, It will take more longer time for
>> forwarding packet. Why do so? Has it some advantage?
>>
>> Sorry for asking you so simple question, and take your
>> time.
>>
>> Best regards
>>
>> Young
>>
>> --- Jason Sinclair <sinclairj@powertel.com.au> ????
>> ?????
>> > Tom,
>> >
>> > Let's start with no ip directed-broadcast:
>> > This instructs the router to not forward packets
>> > that are destined
>> > to a directed broadcast address. For example, a
>> > broadcast is 255.255.255.255
>> > in IP terms. In the case of 192.168.1.0/24, the
>> > directed broadcast address
>> > is 192.168.1.255. Hence the router will not
>> > propagate packets to this
>> > address.
>> >
>> > Now for no ip mroute-cache:
>> > This instructs the router to turn off cache support
>> > for multicast
>> > packets. Basically is the same as turning off
>> > route-cache for unicast
>> > packets and instructs the router to process switch
>> > multicast packets.
>> >
>> > Regards,
>> >
>> > Jason Sinclair CCIE #9100
>> > Manager, Network Control Centre
>> > POWERTEL
>> > Ground Level, 55 Clarence Street,
>> > SYDNEY NSW 2000
>> > AUSTRALIA
>> > office: + 61 2 8264 3820
>> > mobile: + 61 416 105 858
>> > * sinclairj@powertel.com.au
>> >
>> >
>> >
>> >
>> >
>> > -----Original Message-----
>> > From: Tom Young [mailto:gitsyoung@yahoo.co.jp]
>> > Sent: Thursday, 16 May 2002 10:41
>> > To: ccielab@groupstudy.com
>> > Subject: some command
>> >
>> > For some simple command, I couldn't find the
>> > explain from
>> > CCO, who can exlain it to me precisely?
>> > For example:
>> >
>> > no ip directed-broadcast
>> > and
>> > no mroute-cache
>> >
>> >
>> > Thanks
>> >
>> > Young
>> >
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