RE: Cisco CDP through ISA?
- From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 15 Dec 2004 06:46:30 -0800
Want to collaborate on the RFC?
..it can't be any worse than:
http://www.rfc-editor.org/rfc/rfc2323.txt
..or
http://www.rfc-editor.org/rfc/rfc1149.txt
..or
http://www.rfc-editor.org/rfc/rfc2549.txt
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
-----Original Message-----
From: josephk [mailto:josephk@xxxxxxxxx]
Sent: Tuesday, December 14, 2004 10:59 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Cisco CDP through ISA?
http://www.ISAserver.org
Hi there,
I know about the SNAP and POP protocols, but Jim, how would I get this
to
Work with CRACKLE? Do, I have to define a definitive order for those?
Thank you,
Joseph
-----Original Message-----
From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx]
Sent: Tuesday, December 14, 2004 6:52 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Cisco CDP through ISA?
http://www.ISAserver.org
This link:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/12_1e/swconf
ig/cdp.htm
Contains this statement:
Understanding How CDP Works
CDP is a protocol that runs over Layer 2 (the data link layer) on all
Cisco routers, bridges, access servers, and switches. CDP allows network
management applications to discover Cisco devices that are neighbors of
already known devices, in particular, neighbors running lower-layer,
transparent protocols. With CDP, network management applications can
learn the device type and the SNMP agent address of neighboring devices.
This feature enables applications to send SNMP queries to neighboring
devices.
CDP runs on all LAN and WAN media that support Subnetwork Access
Protocol (SNAP).
Each CDP-configured device sends periodic messages to a multicast
address. Each device advertises at least one address at which it can
receive SNMP messages. The advertisements also contain the time-to-live,
or holdtime information, which indicates the length of time a receiving
device should hold CDP information before discarding it.
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
-----Original Message-----
From: William Robertson [mailto:robertson.william@xxxxxxxxxxxxxx]
Sent: Tuesday, December 14, 2004 5:32 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Cisco CDP through ISA?
http://www.ISAserver.org
Hi there
We have recently installed CiscoWorks and have started managing all of
our current Cisco kit. The last goal I have is to monitor the "Internet
Router" on the public interface of my ISA firewall, so I was thinking
that I could merely create a new protocol definition and continue as per
normal...
WRONG!!!
I have just been informed that Cisco's CDP protocol is a layer 2
protocol, and thus cannot be "allowed" through a firewall. Frankly, this
just sounds like a challenge waiting to be accepted... Any takers out
there?
Cheers
William R.
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