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SAP
Community Member

glbp not supported on 3750, why?

question, why isn't glbp supported on 3750-E? doesn't make sense to support it?

4 REPLIES
Silver

Re: glbp not supported on 3750, why?

Well, I can't answer why they haven't added it yet, but they have been adding support very gradually. At first it was only on 7200s, then they added 6500s. I guess maybe in a few years we mat get it on more hardware.

-Eric

Community Member

Re: glbp not supported on 3750, why?

I have two 3825 routers which seemed to run glbp fine, however, I could not communicate to the 3750 switch behind the routers after implementing glbp. HSRP seems to work just fine. Is that what you meant by glbp is not supported on the 3750? If not, does anyone have an idea why implementing glbp on the routers would break connectivity to the switch?

thanks

Community Member

Re: glbp not supported on 3750, why?

I have a simular problem.. 

HSRP runs fine, but reconfigure with GLBP, and anyone in the network cannot ping the switches, or any users on the LAN.

They can ping the router IP's fine.

Users on the LAN cannot ping the router IP's at all.

Switch:

Platform: cisco WS-C3750G-12S,  Capabilities: Router Switch IGMP

C3750 Software (C3750-ADVIPSERVICESK9-M), Version 12.2(37)SE,

Routers:

CISCO3925

c3900-universalk9-mz.SPA.151-4.M4

Config on Router 1

track 100 interface Serial1/0 line-protocol

Interface Gig0/0

glbp 1 ip 10.178.32.6

glbp 1 priority 110

glbp 1 preempt delay minimum 300

glbp 1 load-balancing host-dependent

glbp 1 authentication text CUSTOMER

glbp 1 weighting track 100 decrement 5

Config on Router 2

Interface Gig0/0

glbp 1 ip 10.178.32.6

glbp 1 priority 105

glbp 1 load-balancing host-dependent

glbp 1 preempt delay minimum 5

             glbp 1 authentication text CUSTOMER

sho arp

Protocol  Address          Age (min)  Hardware Addr   Type   Interface

Internet  10.178.32.1           175   0000.0c07.ac64  ARPA   GigabitEthernet0/0

Internet  10.178.32.2           167   3037.a6a3.0ec1  ARPA   GigabitEthernet0/0

Internet  10.178.32.3           166   3037.a6a3.8bc1  ARPA   GigabitEthernet0/0

Internet  10.178.32.4           158   8843.e118.0e00  ARPA   GigabitEthernet0/0

Internet  10.178.32.5             -   d48c.b5bb.7a80  ARPA   GigabitEthernet0/0

Internet  10.178.32.6             -   0000.0c07.ac01  ARPA   GigabitEthernet0/0

Internet  10.192.5.65             -   d48c.b5bb.7a80  ARPA   GigabitEthernet0/

Super Bronze

Re: glbp not supported on 3750, why?

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That's the type of question that only Cisco can answer.  It could be, the 3750 architecture is an impediment; it could be with 3750 stacking, who needs it; it could be with a L3 switch Cisco doesn't see the need to load balance hosts; it could be . . .

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