From: Edwards, Andrew M (andrew.m.edwards@boeing.com)
Date: Thu Apr 07 2005 - 19:07:46 GMT-3
When in doubt, configure both IRDP and VRRP.
Set IRDP such that R1 and R3 are proxy for the GW IP address issued by
DHCP, which also would need to be the VRRP virtual IP.
8)
I love this lab!
-----Original Message-----
From: marvin greenlee [mailto:marvin@ccbootcamp.com]
Sent: Thursday, April 07, 2005 1:34 PM
To: 'mani poopal'; ccielab@groupstudy.com
Subject: RE: vrrp vs irdp [bcc][faked-from][bayes]
VRRP is very similar to HSRP, in that you have an elected virtual router
that forwards packets sent to a virtual IP address.
With DHCP, you have the option of specifying multiple gateways, but it
is up to the end hosts to determine whether a gateway has failed, and to
switch to using the next gateway.
IRDP announces a gateway. By itself, it is not recommended for failure
detection, due to the spacing between advertisements. IRDP can be used
in conjunction with VRRP, and can advertise the IP address of the
virtual address, by setting a priority value.
GLBP is similar to VRRP and HSRP, but multiple routers are active and
the packet forwarding is balanced.
IRDP - RFC 1256
http://www.faqs.org/rfcs/rfc1256.html
VRRP - RFC 3768
http://www.faqs.org/rfcs/rfc3768.html
Cisco - GLBP - Gateway Load Balancing Protocol -
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_
guid
e09186a00801541c8.html
Marvin Greenlee, CCIE#12237, CCSI# 30483
Network Learning Inc
marvin@ccbootcamp.com
www.ccbootcamp.com (Cisco Training)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
mani poopal
Sent: Thursday, April 07, 2005 1:08 PM
To: ccielab@groupstudy.com
Subject: vrrp vs irdp [bcc][faked-from][bayes]
Importance: Low
Hi Guys,
I have a question regarding gateway redundency. If R1 & R3 are
connected by ethernet link(vlan 10) and R3 is the dhcp server. We have
to make R1 as a primary link and R1 as gateway when only primary
fails(Restriction:Not to use hsrp feature)
R1-----VLAN 10 USERS--------R3(DHCP SERVER)
If a question does not ask to track and interfaces and not telling any
thing about irdp asware status of clients. What feature can be
used(vrrp or irdp). Any help is appreciated with good example.
PS:what is the difference between vrrp and irdp and under what
circumstenses we use these features.
thanks
Mani
B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
(416)431 9929
MANI_CCIE@YAHOO.COM
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