Cisco 3560G-24TS HSRP instances

[ngtransge]

Hello,

I am interesting how many HSRP instances does 3560G-24TS switche supports ?

[Reza Sharifi]

Hi,

From the config guide:

HSRP Versions

The switch supports these Hot Standby Redundancy Protocol (HSRP) versions:

•HSRPv1—Version 1 of the HSRP, the default version of HSRP. It has these features:

–The HSRP group number can be from 0 to 255.

–HSRPv1  uses the multicast address 224.0.0.2 to send hello packets, which can  conflict with Cisco Group Management Protocol (CGMP) leave processing.  You cannot enable HSRPv1 and CGMP at the same time; they are mutually  exclusive.

•HSRPv2—Version 2 of the HSRP has these features:

–To  match the HSRP group number to the VLAN ID of a subinterface, HSRPv2  can use a group number from 0 to 4095 and a MAC address from  0000.0C9F.F000 to 0000.0C9F.FFFF.

–HSRPv2  uses the multicast address 224.0.0.102 to send hello packets. HSRPv2  and CGMP leave processing are no longer mutually exclusive, and both can  be enabled at the same time.

–HSRPv2 has a different packet format than HRSPv1.

A switch running HSRPv1 cannot identify the physical router that sent a  hello packet because the source MAC address of the router is the virtual  MAC address.

HSRPv2 has a different packet format than HSRPv1. A HSRPv2 packet uses  the type-length-value (TLV) format and has a 6-byte identifier field  with the MAC address of the physical router that sent the packet.

If an interface running HSRPv1 gets an HSRPv2 packet, the type field is ignored.

Here is the link:

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_52_se/configuration/guide/swhsrp.html

HTH

[darren.g · Accepted solution]

ngtransge wrote:
Hello,
I am interesting how many HSRP instances does 3560G-24TS switche supports ?

According to this

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_52_se/configuration/guide/swhsrp.html#wp1051422

document, you can configure 32 HSRP instances on a 3560G switch. If you configure the same HSRP group on multiple interfaces, each interface counts as one instance.

Cheers

[ngtransge]

Thank you for helping,

What about 3560X.Is it true "If you configure the same HSRP group on multiple interfaces, each interface counts as one instance" for 3560X ? I was doing some research but could not find it.

[Latchum Naidu]

Hi,

Even this also support up to 32 HSRP instances.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/12.2_55_se/configuration/guide/swhsrp.html

And yes, each interface with assigned ip address count as one instance.

Please rate the helpfull posts.
Regards,
Naidu.