Cisco ISR 4451-X HSRP group limit

[Cannoo]

Hi,

We have 49 HSRP groups on one interface of our current routers and need to migrate to the 4451's, but the limit appears to be 25. Does anyone know if this is a hardware limit that won't be increased or if there is a possibility for a firmware upgrade to increase it? I have already upgraded them to the latest release and it's at 25.

Thanks

[balaji.bandi]

can you post show version (old and new device to understand the issue)

also post full logs you see on the new device.

[Cannoo]

Cisco IOS Software, C3900e Software (C3900e-UNIVERSALK9-M), Version 15.4(3)M5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Tue 09-Feb-16 00:34 by prod_rel_team

ROM: System Bootstrap, Version 15.1(1r)T4, RELEASE SOFTWARE (fc1)

 uptime is 20 weeks, 1 day, 16 hours, 35 minutes
System returned to ROM by power-on
System image file is "flash0:c3900e-universalk9-mz.SPA.154-3.M5.bin"
Last reload type: Normal Reload
Last reload reason: power-on



This product contains cryptographic features and is subject to United
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third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
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agree to comply with applicable laws and regulations. If you are unable
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If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco CISCO3925-CHASSIS (revision 1.0) with C3900-SPE200/K9 with 754688K/293888K bytes of memory.
Processor board ID FCZ154620L9
4 Gigabit Ethernet interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 72 bits wide with parity enabled.
256K bytes of non-volatile configuration memory.
255744K bytes of ATA System CompactFlash 0 (Read/Write)


License Info:

License UDI:

Technology Package License Information for Module:'c3900e'

------------------------------------------------------------------------
Technology    Technology-package                  Technology-package
              Current              Type           Next reboot
------------------------------------------------------------------------
ipbase        ipbasek9             Permanent      ipbasek9
security      securityk9           Permanent      securityk9
uc            None                 None           None
data          datak9               Permanent      datak9
NtwkEss       None                 None           None
CollabPro     None                 None           None

Configuration register is 0x2102

Old devices are 3925's and show version provided. Don't currently have access to the new routers today. I can grab this, but don't think it's needed for the issue?

The 4451' s are on version 16.12 (

isr4400-universalk9.16.12.04.SPA.bin

).

show standby capability from 4451's:

ISR4451-X/K9 * indicates hardware may support HSRP
|
Interface Type H Potential Max Groups per subin
Gi0/0/0 27 ISR4451-X-4x1GE * 25
Gi0/0/1 27 ISR4451-X-4x1GE * 25
Gi0/0/2 27 ISR4451-X-4x1GE * 25
Gi0/0/3 27 ISR4451-X-4x1GE * 25
GigabitEthernet0 27 RP management port * 4096
LIIN0 27 LIIN -

[Georg Pauwen]

Hello,

does that limit still apply with HSRP version 2 (with 1 being the default I think) ?

interface GigabitEthernet0/0

--> standby version 2

[Cannoo · Accepted solution]

Thank you to anyone who responded, but I have spoken to a Cisco support engineer now and it is indeed a hardware limit on the number of MAC addresses that can be stored. Only option would be an additional module for the switch that can support more addresses.