From: marvin greenlee (marvin@ccbootcamp.com)
Date: Fri Apr 08 2005 - 15:50:45 GMT-3
Actually, it's a preference level, not a priority level. (Slight typo
earlier )
From the RFC:
"...A Router Advertisement includes a "preference level" for each
advertised router address. When a host must choose a default router
address (i.e., when, for a particular destination, the host has not
been redirected or configured to use a specific router address), it
is expected to choose from those router addresses that have the
highest preference level (see Section 3.3.1 in the Host Requirements
-- Communication Layers RFC [1]). A network administrator can
configure router address preference levels to encourage or discourage
the use of particular routers as default routers...."
From a router:
r5(config)#int eth0/0
r5(config-if)#ip irdp
r5(config-if)#ip irdp address 10.1.1.1 1
r5#show ip irdp
Ethernet0/0 has router discovery enabled
Advertisements will occur between every 450 and 600 seconds.
Advertisements are sent with broadcasts.
Advertisements are valid for 1800 seconds.
Default preference will be 0.
Proxy for 10.1.1.1 with preference 1.
BRI0/0 has router discovery disabled
(In this case, 10.1.1.1 would be the virtual address being advertised. )
Marvin Greenlee, CCIE#12237, CCSI# 30483
Network Learning Inc
marvin@ccbootcamp.com
www.ccbootcamp.com (Cisco Training)
-----Original Message-----
From: Peter Ding [mailto:pding@cisco.com]
Sent: Friday, April 08, 2005 11:06 AM
To: marvin greenlee; ccielab@groupstudy.com
Subject: RE: vrrp vs irdp [bcc][faked-from][bayes]
Hi Marvin,
You mentioned that "IRDP can be used in conjunction with VRRP, and can
advertise the IP address of the virtual address, by setting a priority
value."
Could you provide an example or a link and shows how IRDP can advertise the
virtual address configured with VRRP?
Thanks,
PD
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
marvin greenlee
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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