01-04-2008 10:55 PM - edited 03-05-2019 08:17 PM
Sir EdisonOrtiz,
How are you Sir? I tried the configuration that you gave me but the problem is that 4908G switch wasn't recognized switchport command thus I cannot make the interface as trunk. So still I cannot connect to my 3750 switch. By the way the reason for BVI configuration was for routing. and for you to have a better feel of our switch configuration below is the configuration for both 4908G and 3750 switch. note: 4908G switch is the active.
4908G-L3 config:
bridge irb
!
!
!
interface Port-channel1
no ip address
no ip directed-broadcast
hold-queue 300 in
!
interface Port-channel1.1
encapsulation isl 1
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet1
no ip address
no ip directed-broadcast
!
interface GigabitEthernet1.1
encapsulation isl 1
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet1.10
encapsulation isl 10
ip address 172.25.x.y 255.255.b.z
ip helper-address 172.25.a.a
no ip redirects
no ip directed-broadcast
standby 10 priority 105 preempt
standby 1 ip 172.25.f.g
!
interface GigabitEthernet2
no ip address
no ip directed-broadcast
!
interface GigabitEthernet2.1
encapsulation isl 1
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet2.20
encapsulation isl 20
ip address 172.25.x.y 255.255.b.z
ip helper-address 172.25.a.a
no ip redirects
no ip directed-broadcast
standby 20 priority 105 preempt
standby 1 ip 172.25.f.g
!
--line omitted--
!
interface GigabitEthernet7
no ip address
no ip directed-broadcast
!
interface GigabitEthernet7.1
encapsulation isl 1
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet7.70
encapsulation isl 70
ip address 172.25.x.y 255.255.b.z
ip helper-address 172.25.a.a
no ip redirects
no ip directed-broadcast
standby 70 preempt
standby 1 ip 172.25.f.g
!
interface GigabitEthernet8
no ip address
no ip directed-broadcast
channel-group 1
!
interface BVI1
ip address 172.25.x.y 255.255.b.z
ip helper-address 172.25.a.a
no ip redirects
no ip directed-broadcast
standby 1 priority 105 preempt
standby 1 ip 172.25.f.g
!
router eigrp 200
network 172.25.0.0
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.25.d.e
!
bridge 1 protocol ieee
bridge 1 route ip
!
end
3750 switch config:
bridge irb
!
interface Port-channel1
hold-queue 300 in
!
interface GigabitEthernet1/0/1
no switchport
ip address 172.25.x.y 255.255.b.z
ip helper-address 172.25.a.a
standby 10 ip 172.25.f.g
standby 10 preempt
bridge-group 1
no shutdown
!
interface GigabitEthernet1/0/2
no switchport
ip address 172.25.x.y 255.255.b.z
ip helper-address 172.25.a.a
standby 20 ip 172.25.f.g
standby 20 preempt
bridge-group 1
no shutdown
!
--line omitted--
!
interface GigabitEthernet1/0/7
no switchport
ip address 172.25.x.y 255.255.b.z
ip helper-address 172.25.a.a
standby 70 ip 172.25.f.g
standby 70 preempt
standby 70 priority 105
bridge-group 1
no shutdown
!
interface GigabitEthernet1/0/8
!
interface GigabitEthernet1/0/9
!
interface GigabitEthernet1/0/10
!
interface GigabitEthernet1/0/11
!
interface GigabitEthernet1/0/12
channel-group 1 mode on
no shutdown
!
interface BVI1
ip address 172.25.x.y 255.255.b.z
ip helper-address 172.25.a.a
no ip route-cache cef
standby 1 preempt
standby 1 ip 172.25.f.g
!
exit
!
bridge 1 protocol vlan-bridge
bridge 1 route ip
!
ip routing
router eigrp 200
network 172.25.0.0
no auto-summary
!
exit
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.25.d.e
!
end
01-04-2008 11:38 PM
I might be missing part of the story here, however, the 3750 does not support ISL.
Your subinterface configurations on the 4908G do, effectively, make those links trunks. You just need to change the encapsulation type to dot1q and give it a vlan identifier.
Do you really need to bridge in between all of them, or do you want to bond them together into an etherchannel? If so, you don't want bridging on at all. Just configure up all your ports in the etherchannel and apply your ip configuration to the port-channel.subinterface.
As to the Catalyst 3750, you definitely don't want to use BVIs - the platform doesn't actually support them, and you couldn't have ip addresses on all of those physical interfaces within a bridge group anyway, or all of that HSRP configuration or anything.
Set the individual ports to switchports, then you can set them as trunks that carry your VLAN identifiers, then you can assign just one ip address to each VLAN interfaces, for example one for interface vlan1, one for vlan10, and one for vlan20.
If you're not going to be using multiple vlans on an interface, you can just apply the ip information directly to an interface that has "no switchport" in it.
I am unsure as to what you'd like to do with the Etherchannels, I only see one interface in a channel group on each side. On the Catalyst 4908G, you basically will want one port-channel.subinterface for each VLAN you want to carry. On the Catalyst 3750 it depends, again, on exactly what you're planning to carry - you can either put several links directly into the port-channel and add ip information, or tie several trunks together and apply their ip information to their VLAN interfaces.
So, quick recap: 3750 only supports ISL, and does NOT actually support BVIs. Eliminate redundant IP addressing and apply it only to the BVI, subinterface, or VLAN interface where it is required. 3750 links can carry multiple VLANs by making them trunks and adding the VLAN ids.
Hope this helps a little.
01-05-2008 12:21 AM
First, thanks for your time and quick response. Well, to give you further info the objective of these 4908G and 3750 switches should be redundant to each other so that when one of the switch fails the other will be ready to take over and its function is to provide individual inter-vlan communication for each vlan.
Everything was working fine before until one of the two 4908G had failed and eventually replaced by 3750 switch. Now I cannot connect to 3750 switch and it doesn't establish a connection to my network when I tried to turn off the 4908G. The 3750 switch was suppose to provide the inter-vlan communication if the 4908G fails.
So, how do you think I would configure the 3750 to work as a reduntant switch to 4908G? And why do you think my 4908G doesn't support switchport command to set the port to trunk?
thanks.
01-05-2008 12:56 AM
You have to make your encapsulation dot1q on the 4908G! Good luck!
NS
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide