I had to verify the answer for the first question. I have posted it below:
QUESTION:
1 Which network layer use to encapsulation isis-pdu?
Is it clnp or ip?
ANSWER:
ISIS PDU's are not encapsulated in IP. Like IP, CLNP (often referred to as
OSI) runs at the network-layer. It is often stated that IS-IS runs directly
over the data-link (L2) protocol. However, IS-IS uses CLNP packet types.
Mario Puras
SoluNet Technical Support
Network Support Engineer
We don't make network products,
we make them Work!
Mailto:mpuras@solunet.com <mailto:mpuras@solunet.com>
888.SOLUNET (Canada) / 888.449.5766 (USA)
-----Original Message-----
From: Chris Flores [mailto:chris.flores@onfiber.com]
Sent: Wednesday, April 25, 2001 4:39 PM
To: 'MPuras@solunet.com'; zjgu@ce-air.com; mpls-ops@mplsrc.com;
juniper-nsp@puck.nether.net; aviva@juniper.net
Subject: RE: [j-nsp] isis question
I agree, this becomes a matter of semantics. I stated in my email that a
single p2p link connecting to a neighbor establishes one adjacency. A
level-1/level-2 IS (router) implies a minimum of two p2p links, one
connecting to a level-1 IS and another connecting to a level-2 IS. Thus, two
neighbors and two adjacencies. I was taking a simpler approach to my email
:-) Thank you for the clarification...
Best regards.
Chris
-----Original Message-----
From: MPuras@solunet.com [mailto:MPuras@solunet.com]
Sent: Wednesday, April 25, 2001 11:12 AM
To: Chris Flores; zjgu@ce-air.com; mpls-ops@mplsrc.com;
juniper-nsp@puck.nether.net; aviva@juniper.net
Subject: RE: [j-nsp] isis question
#2.
Depends - I believe by default L1/L2 is enabled on Juniper, therefore 2
adjacencies. Otherwise, if L1 only or if L2 only, then only a single
adjacency.
Mario Puras
SoluNet Technical Support
Network Support Engineer
We don't make network products,
we make them Work!
Mailto:mpuras@solunet.com <mailto:mpuras@solunet.com>
888.SOLUNET (Canada) / 888.449.5766 (USA)
-----Original Message-----
From: Chris Flores [mailto:chris.flores@onfiber.com]
Sent: Wednesday, April 25, 2001 10:59 AM
To: 'zheng jiang gu'; mpls-ops@mplsrc.com; juniper-nsp@puck.nether.net;
Aviva Garrett
Subject: RE: [j-nsp] isis question
My response is in-line. I hope it helps...
-----Original Message-----
From: zheng jiang gu [mailto:zjgu@ce-air.com]
Sent: Tuesday, April 24, 2001 9:15 PM
To: mpls-ops@mplsrc.com; juniper-nsp@puck.nether.net; Aviva Garrett
Subject: [j-nsp] isis question
hi all:
When I study isis, I meet the problem:
1 Which network layer use to encapsulation isis-pdu?
Is it clnp or ip?
CF: The OSI packets (or PDUs) are forwarded "as is" or transmitted directly
over the underlying link layer without the need for encapsulation - per RFC
1195.
2 How many IS-IS adjacency between point-to-point routers?
CF: IIH (IS-IS Hello) PDUs are utilized to initialize and maintain
adjacencies between neighbors. On a p2p link, one neighbor creates one
adjacency. Do you have a more specific question that needs answering?
br
shawn
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