Routing Working Group M. Jethanandani
Internet-Draft Ciena Corporation
Intended status: Informational K. Patel
Expires: December 25, 2012 Cisco Systems, Inc
L. Zheng
Huawei
June 23, 2012
Analysis of BGP, LDP, PCEP and MSDP Issues According to KARP Design
Guide
draft-ietf-karp-routing-tcp-analysis-02.txt
Abstract
This document analyzes BGP, LDP, PCEP and MSDP according to
guidelines set forth in section 4.2 of Keying and Authentication for
Routing Protocols Design Guidelines [RFC6518].
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119]..
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on December 25, 2012.
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Provisions Relating to IETF Documents
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Contributing Authors . . . . . . . . . . . . . . . . . . . 3
1.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 3
2. Current State of BGP, LDP, PCEP and MSDP . . . . . . . . . . . 5
2.1. Transport level . . . . . . . . . . . . . . . . . . . . . 5
2.2. Keying mechanisms . . . . . . . . . . . . . . . . . . . . 6
2.3. LDP . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3.1. Spoofing attacks . . . . . . . . . . . . . . . . . . . 6
2.3.2. Privacy Issues . . . . . . . . . . . . . . . . . . . . 7
2.3.3. Denial of Service Attacks . . . . . . . . . . . . . . 7
2.4. PCEP . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5. MSDP . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. Optimal State for BGP, LDP, PCEP, and MSDP . . . . . . . . . . 9
3.1. LDP . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Gap Analysis for BGP, LDP, PCEP and MSDP . . . . . . . . . . . 10
4.1. LDP . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2. PCEP . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. Transition and Deployment Considerations . . . . . . . . . . . 12
6. Security Requirements . . . . . . . . . . . . . . . . . . . . 13
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 14
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.1. Normative References . . . . . . . . . . . . . . . . . . . 15
8.2. Informative References . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17
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1. Introduction
In March 2006 the Internet Architecture Board (IAB) in its "Unwanted
Internet Traffic" workshop documented in Report from the IAB workshop
on Unwanted Traffic March 9-10, 2006 [RFC4948] described an attack on
core routing infrastructure as an ideal attack with the most amount
of damage. Four main steps were identified for that tightening:
1. Create secure mechanisms and practices for operating routers.
2. Clean up the Internet Routing Registry [IRR] repository, and
securing both the database and the access, so that it can be used
for routing verifications.
3. Create specifications for cryptographic validation of routing
message content.
4. Secure the routing protocols' packets on the wire.
This document looking at the last bullet performs the initial
analysis of the current state of BGP, LDP, PCEP and MSDP according to
the requirements of KARP Design Guidelines [RFC6518]. This draft
builds on several previous analysis efforts into routing security.
The OPSEC working group put together Issues with existing
Cryptographic Protection Methods for Routing Protocols [RFC6039] an
analysis of cryptographic issues with routing protocols and Analysis
of OSPF Security According to KARP Design Guide
[draft-ietf-karp-ospf-analysis-03].
Section 2 looks at the current state of the four routing protocols.
Section 3 goes into what the optimal state would be for the three
routing protocols according to KARP Design Guidelines [RFC6518] and
Section 4 does a analysis of the gap between the existing state and
the optimal state of the protocols and suggest some areas where we
need to improve.
1.1. Contributing Authors
Anantha Ramaiah, Mach Chen
1.2. Abbreviations
BGP - Border Gateway Protocol
DoS - Denial of Service
KARP - Key and Authentication for Routing Protocols
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KDF - Key Derivation Function
KEK - Key Encrypting Key
KMP - Key Management Protocol
LDP - Label Distribution Protocol
LSR - Label Switch Routers
MAC - Message Authentication Code
MKT - Master Key Tuple
MSDP - Multicast Source Distribution Protocol
MD5 - Message Digest algorithm 5
OSPF - OPen Shortest Path First
PCEP - Path Computation Element Protocol
TCP - Transmission Control Protocol
UDP - User Datagram Protocol
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2. Current State of BGP, LDP, PCEP and MSDP
This section looks at the underlying transport protocol and key
mechanisms built for the protocol. It describes the security
mechanisms built into BGP, LDP, PCEP and MSDP.
2.1. Transport level
At a transport level, routing protocols are subject to a variety of
DoS attacks. Such attacks can cause the routing protocol to become
congested with the result that routing updates are supplied too
slowly to be useful or in extreme case prevent route convergence
after a change.
Routing protocols use several methods to protect themselves. Those
that run use TCP as a transport protocol use access list to permit
packets from know sources only. These access lists also help edge
routers from attacks originating from outside the protected cloud.
In addition for edge routers running eBGP, TCP LISTEN is run only on
interfaces on which its peers have been discovered or that are
configured to expect routing sessions on.
GTSM [RFC5082] describes a generalized Time to Live (TTL) security
mechanism to protect a protocol stack from CPU-utilization based
attacks.TCP Robustness [RFC5961] recommends some TCP level
mitigations against spoofing attacks targeted towards long lived
routing protocol sessions.
Even when BGP, LDP, PCEP and MSDP sessions use access list they are
subject to spoofing and man in the middle attacks. Authentication
and integrity checks allow the receiver of a routing protocol update
to know that the message genuinely comes from the node that purports
to have sent it and to know whether the message has been modified.
Sometimes routers can be subjected to a large number of
authentication and integrity checks which can result in genuine
requests failing.
TCP MD5 [RFC2385] specifies a mechanism to protect BGP and other TCP
based routing protocols via the TCP MD5 option. TCP MD5 option
provides a way for carrying an MD5 digest in a TCP segment. This
digest acts like a signature for that segment, incorporating
information known only to the connection end points. The MD5 key
used to compute the digest is stored locally on the router. This
option is used by routing protocols to provide for session level
protection against the introduction of spoofed TCP segments into any
existing TCP streams, in particular TCP Reset segments. TCP MD5 does
not provide a generic mechanism to support key roll-over.
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However, the Message Authentication Codes (MACs) used by MD5 to
compute the signature are considered to be too weak. TCP-AO
[RFC5925] and its companion document Crypto Algorithms for TCP-AO
[RFC5926] describe steps towards correcting both the MAC weakness and
KMP. For MAC it specifies two MAC algorithms that MUST be supported.
They are HMAC-SHA-1-96 as specified in HMAC [RFC2104] and AES-128-
CMAC-96 as specified in NIST-SP800-38B [NIST-SP800-38B].
Cryptographic research suggests that both these MAC algorithms
defined are fairly secure and are not known to be broken in any ways.
It also provides for additional MACs to be added in the future.
2.2. Keying mechanisms
For TCP-AO [RFC5925] there is no Key Management Protocol (KMP) used
to manage the keys that are used for generating the Message
Authentication Code (MAC). It allows for a master key to be
configured manually or for it to be managed from a out of band
mechanism. Most routers are configured with a static key that does
not change over the life of the session.
It should also be mentioned that those routers that have been
configured with static keys have not seen the key changed. The
common reason given for not changing the key is the difficulty in
coordinating the change, at least with TCP MD5. It is well known
that longer the same key is used, higher is the chance that it can be
guessed, particularly if it is not a strong key.
For point-to-point key management IKE [RFC2409] tries to solve the
issue of key exchange under a SA.
2.3. LDP
Section 5 of LDP [RFC5036] states that LDP is subject to three
different types of attacks. These are spoofing, protection of
privacy of label distribution and denial of service attacks.
2.3.1. Spoofing attacks
Spoofing attack for LDP occur both during the discovery phase and
during the session communication phase.
2.3.1.1. Discovery exchanges using UDP
Label Switching Routers (LSRs) indicate their willingness to
establish and maintain LDP sessions by periodically sending Hello
messages. Receipt of a Hello message serves to create a new "Hello
adjacency", if one does not already exist, or to refresh an existing
one.
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Unlike all other LDP messages, the Hello messages are sent using UDP
not TCP. This means that they cannot benefit from the security
mechanisms available with TCP. LDP [RFC5036] does not provide any
security mechanisms for use with Hello messages except to note that
some configuration may help protect against bogus discovery events.
Spoofing a Hello packet for an existing adjacency can cause the
adjacency to time out and that can result in termination of the
associated session. This can occur when the spoofed Hello message
specifies a small Hold Time, causing the receiver to expect Hello
messages within this interval, while the true neighbor continues
sending Hello messages at the lower, previously agreed to, frequency.
Spoofing a Hello packet can also cause the LDP session to be
terminated directly. This can occur when the spoofed Hello specifies
a different Transport Address from the previously agreed one between
neighbors. Spoofed Hello messages are observed and reported as real
problem in production networks.
2.3.1.2. Session communication using TCP
LDP like other TCP based routing protocols specifies use of the TCP
MD5 Signature Option to provide for the authenticity and integrity of
session messages. As stated above, some assert that MD5
authentication is now considered by some to be too weak for this
application. A stronger hashing algorithm e.g SHA1, could be
deployed to take care of the weakness.
Alternatively, one could move to using TCP-AO which provides for
stronger MACs and protects against replays.
2.3.2. Privacy Issues
LDP provides no mechanism for protecting the privacy of label
distribution. The security requirements of label distribution are
similar to other routing protocols that need to distribute routing
information.
2.3.3. Denial of Service Attacks
LDP is subject to Denial of Service (DoS) attacks both in its
discovery mode as well as during the session mode.
The discovery mode attack is similar to the spoofing attack except
that when the spoofed Hello messages are sent with a high enough
frequency can cause the adjacency to time out.
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2.4. PCEP
Attacks on PCEP [RFC5440] may result in damage to active networks.
This may include computation responses, which if changed can cause
protocols like LDP to setup sub-optimal or inappropriate LSPs. In
addition, PCE itself can be attacked by a variety of DoS attacks.
Such attacks can cause path computations to be supplied too slowly to
be of any value particularly as it relates to recovery or
establishment of LSPs.
As the RFC states, PCEP could be the target of the following attacks.
o Spoofing (PCC or PCE implementation)
o Snooping (message interception)
o Falsification
o Denial of Service
According to the RFC, inter-AS scenarios when PCE-to-PCE
communication is required, attacks may be particularly significant
with commercial as well as service-level implications.
Additionally, snooping of PCEP requests and responses may give an
attacker information about the operation of the network. Simply by
viewing the PCEP messages someone can determine the pattern of
service establishment in the network and can know where traffic is
being routed, thereby making the network susceptible to targeted
attacks and the data within specific LSPs vulnerable.
Ensuring PCEP communication privacy is of key importance, especially
in an inter-AS context, where PCEP communication end-points do not
reside in the same AS, as an attacker that intercepts a PCE message
could obtain sensitive information related to computed paths and
resources.
2.5. MSDP
Similar to BGP and LDP, TCP MD5 [RFC2385] specifies a mechanism to
protect TCP sessions via the TCP MD5 option. But with a weak MD5
authentication, TCP MD5 is not considered strong enough for this
application.
MSDP also advocates imposing a limit on number of source address and
group addresses (S,G) that can be stored within the protocol and
thereby mitigate state explosion due to any denial of service and
other attacks.
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3. Optimal State for BGP, LDP, PCEP, and MSDP
The ideal state for BGP, LDP and MSDP protocols are when they can
withstand any of the known types of attacks.
Additionally, Key Management Protocol (KMP) for the routing sessions
should help negotiate unique, pair wise random keys without
administrator involvement. It should also negotiate Security
Association (SA) parameter required for the session connection,
including key life times. It should keep track of those lifetimes
and negotiate new keys and parameters before they expire and do so
without administrator involvement. In the event of a breach,
including when an administrator with knowledge of the keys leaves the
company, the keys should be changed immediately.
The DoS attacks for BGP, LDP, PCEP and MSDP are attacks to the
transport protocol, TCP in this case. TCP should be able to
withstand any of DoS scenarios by dropping packets that are attack
packets in a way that does not impact legitimate packets.
The routing protocols should provide a mechanism to determine
authenticate and validate the routing information carried within the
payload.
3.1. LDP
For the spoofing kind of attacks that LDP is vulnerable to during the
discovery phase, it should be able to determine the authenticity of
the neighbors sending the Hello message.
There is currently no requirement to protect the privacy of label
distribution as labels are carried in the clear like other routing
information.
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4. Gap Analysis for BGP, LDP, PCEP and MSDP
This section outlines the differences between the current state of
the routing protocol and the desired state as outlined in section 4.2
of KARP Design Guidelines [RFC6518]. As that document states, these
routing protocols fall into the category of the one-to-one peering
messages and will use peer keying protocol. It covers issues that
are common to the four protocols leaving protocol specific issues to
sub-sections.
At a transport level the routing protocols are subject to some of the
same attacks that TCP applications are subject to. These include but
are not limited to DoS attacks. Defending TCP Against Spoofing
Attacks [RFC4953] recommends ways to do just that. In addition
Improving TCP's Robustness to Blind In-Window Attacks. [RFC5961]
should also be followed and implemented.
From a security perspective there is a lack of comprehensive KMP. As
an example TCP-AO [RFC5925] talks about coordinating keys derived
from MKT between endpoints, but the MKT itself has to be configured
manually or through a out of band mechanism. Even when keys are
configured manually, a method for when to start using the new keys or
stop using old keys has not been defined. This leads to keys not
being updated regularly which in itself increases the security risk.
Also TCP-AO does not address the issue of connectionless reset, as it
applies to routers that do not store MKT across reboots.
Authentication, tamper protection, and encryption all require the use
of keys by sender and receiver. An automated KMP therefore has to
include a way to distribute MKT between two end points with little or
no administration overhead. It has to cover automatic key rollover.
It is expected that authentication will cover the packet, i.e. the
payload and the TCP header and will not cover the frame i.e. the link
layer 2 header.
There are two methods of automatic key rollover. Implicit key
rollover can be initiated after certain volume of data gets exchanged
or when a certain time has elapsed. This does not require explicit
signaling nor should it result in a reset of the TCP connection in a
way that the links/adjacencies are affected. On the other hand,
explicit key rollover requires a out of band key signaling mechanism.
It can be triggered by either side and can be done anytime a security
parameter changes e.g. an attack has happened, or a system
administrator with access to the keys has left the company. An
example of this is IKE [RFC2409] but it could be any other new
mechanisms also.
As stated earlier TCP-AO [RFC5925] and its accompanying document
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Crypto Algorithms for TCP-AO [RFC5926] suggest that two MAC
algorithms that MUST be supported are HMAC-SHA-1-96 as specified in
HMAC [RFC2104] and AES-128-CMAC-96 as specified in NIST-SP800-38B
[NIST-SP800-38B].
There is a need to protect authenticity and validity of the routing/
label information that is carried in the payload of the sessions.
However, we believe that is outside the scope of this document at
this time and is being addressed by SIDR WG. Similar mechanisms
could be used for intra-domain protocols.
4.1. LDP
As described in LDP [RFC5036], the threat of spoofed Basic Hellos can
be reduced by accepting Basic Hellos on interfaces that LSRs trust,
employing GTSM [RFC5082] and ignoring Basic Hellos not addressed to
the "all routers on this subnet" multicast group. Spoofing attacks
via Extended Hellos are potentially a more serious threat. An LSR
can reduce the threat of spoofed Extended Hellos by filtering them
and accepting Hellos from sources permitted by an access list.
However, performing the filtering using access lists requires LSR
resource, and the LSR is still vulnerable to the IP source address
spoofing. Spoofing attacks can be solved by being able to
authenticate the Hello messages, and an LSR can be configured to only
accept Hello messages from specific peers when authentication is in
use.
LDP Hello Cryptographic Authentication
[draft-zheng-mpls-ldp-hello-crypto-auth-01] suggest a new
Cryptographic Authentication TLV that can be used as an
authentication mechanism to secure Hello messages.
4.2. PCEP
PCE discovery according to its RFC is a significant feature for the
successful deployment of PCEP in large networks. This mechanism
allows a PCC to discover the existence of suitable PCEs within the
network without the necessity of configuration. It should be obvious
that, where PCEs are discovered and not configured, the PCC cannot
know the correct key to use. There are different approaches to
retain some aspect of security, but all of them require use of a keys
and a keying mechanism, the need for which has been discussed above.
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5. Transition and Deployment Considerations
As stated in KARP Design Guidelines [RFC6518] it is imperative that
the new authentication and security mechanisms defined support
incremental deployment, as it is not feasible to deploy the new
routing protocol authentication mechansim overnight.
Typically authentication and security in a peer-to-peer protocol
requires that both parties agree to the mechanisms that will be used.
If an agreement is not reached the setup of the new mechanism will
fail or will be deferred. Upon failure, the routing protocols can
fallback to the mechanisms that were already in place e.g. use static
keys if that was the mechanism in place. It is usually not possible
for one end to use the new mechanism while the other end uses the
old. Policies can be put in place to retry upgrading after a said
period of time, so a manual coordiantion is not required.
If the automatic KMP requires use of public/private keys to exchange
key material, the required CA root certificates may need to be
installed to verify authenticity of requests initiated by a peer.
Such a step does not require coordination with the peer except to
decide what CA authority will be used.
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6. Security Requirements
This section describes requirements for BGP, LDP, PCEP and MSDP
security that should be met within the routing protocol.
As with all routing protocols, they need protection from both on-path
and off-path blind attacks. A better way to protect them would be
with per-packet protection using a cryptographic MAC. In order to
provide for the MAC, keys are needed.
Once keys are used, mechanisms are required to support key rollover.
This should cover both manual and automatic key rollover. Multiple
approaches could be used. However since the existing mechanisms
provide a protocol field to identify the key as well as management
mechanisms to introduce and retire new keys, focusing on the existing
mechanism as a starting point is prudent.
Finally, replay protection is required. The replay mechanism needs
to be sufficient to prevent an attacker from creating a denial of
service or disrupting the integrity of the routing protocol by
replaying packets. It is important that an attacker not be able to
disrupt service by capturing packets and waiting for replay state to
be lost.
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7. Acknowledgements
We would like to thank Brian Weis for encouraging us to write this
draft and providing comments on it.
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8. References
8.1. Normative References
[RFC2385] Heffernan, A., "Protection of BGP Sessions via the TCP MD5
Signature Option", RFC 2385, August 1998.
[RFC5926] Lebovitz, G. and E. Rescorla, "Cryptographic Algorithms
for the TCP Authentication Option (TCP-AO)", RFC 5926,
June 2010.
[RFC6518] Lebovitz, G. and M. Bhatia, "Keying and Authentication for
Routing Protocols (KARP) Design Guidelines", RFC 6518,
February 2012.
[draft-ietf-karp-threats-reqs]
Lebovitz, G. and M. Bhatia, "KARP Threats and
Requirements", March 2012.
8.2. Informative References
[NIST-SP800-38B]
Dworking, "Recommendation for Block Cipher Modes of
Operation: The CMAC Mode for Authentication", May 2005.
[RFC2104] Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-
Hashing for Message Authentication", RFC 2104,
February 1997.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2409] Harkins, D. and D. Carrel, "The Internet Key Exchange
(IKE)", RFC 2409, November 1998.
[RFC3547] Baugher, M., Weis, B., Hardjono, T., and H. Harney, "The
Group Domain of Interpretation", RFC 3547, July 2003.
[RFC4271] Rekhter, Y., Li, T., and S. Hares, "A Border Gateway
Protocol 4 (BGP-4)", RFC 4271, January 2006.
[RFC4948] Andersson, L., Davies, E., and L. Zhang, "Report from the
IAB workshop on Unwanted Traffic March 9-10, 2006",
RFC 4948, August 2007.
[RFC4953] Touch, J., "Defending TCP Against Spoofing Attacks",
RFC 4953, July 2007.
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[RFC5036] Andersson, L., Minei, I., and B. Thomas, "LDP
Specification", RFC 5036, October 2007.
[RFC5082] Gill, V., Heasley, J., Meyer, D., Savola, P., and C.
Pignataro, "The Generalized TTL Security Mechanism
(GTSM)", RFC 5082, October 2007.
[RFC5440] Vasseur, JP. and JL. Le Roux, "Path Computation Element
(PCE) Communication Protocol (PCEP)", RFC 5440,
March 2009.
[RFC5925] Touch, J., Mankin, A., and R. Bonica, "The TCP
Authentication Option", RFC 5925, June 2010.
[RFC5961] Ramaiah, A., Stewart, R., and M. Dalal, "Improving TCP's
Robustness to Blind In-Window Attacks", RFC 5961,
August 2010.
[RFC6039] Manral, V., Bhatia, M., Jaeggli, J., and R. White, "Issues
with Existing Cryptographic Protection Methods for Routing
Protocols", RFC 6039, October 2010.
[draft-ietf-karp-ospf-analysis-03]
Hartman, S., "Analysis of OSPF Security According to KARP
Design Guide", March 2012.
[draft-zheng-mpls-ldp-hello-crypto-auth-01]
Zheng, "LDP Hello Cryptographic Authentication",
March 2011.
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Authors' Addresses
Mahesh Jethanandani
Ciena Corporation
1741 Technology Drive
San Jose, CA 95110
USA
Phone: + (408) 436-3313
Email: mjethanandani@gmail.com
Keyur Patel
Cisco Systems, Inc
170 Tasman Drive
San Jose, CA 95134
USA
Phone: +1 (408) 526-7183
Email: keyupate@cisco.com
Lianshu Zheng
Huawei
No. 3 Xinxi Road, Hai-Dian District
Beijing, 100085
China
Phone: +86 (10) 82882008
Fax:
Email: verozheng@huawei.com
URI:
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