06-15-2018 01:55 PM - edited 03-08-2019 03:23 PM
Greetings All,
I wanted to ask for guidance in configuring a cross-stack etherchannel between an isr 4451-X via 1Gbps Fiber to 4 3850 switches in stackwise configuration.
I would prefer not to assign an IP address to my port channel.
Here's what I have, the port channel comes up on both sides but i'm unable to ping from the switches to the router.
Router connected to switches through (SM-X-6X1G):
interface Port-channel5
description Fiber_Bundle_to_Core_3850_Switches
mtu 9198
no ip address
no negotiation auto
service instance 1 ethernet
encapsulation dot1q 1
rewrite ingress tag pop 1 symmetric
snmp ifindex persist
bridge-domain 1
!
service instance 100 ethernet
description Vlan 100
encapsulation dot1q 100
rewrite ingress tag pop 1 symmetric
snmp ifindex persist
bridge-domain 100
!
service instance 200 ethernet
encapsulation dot1q 200
rewrite ingress tag pop 1 symmetric
snmp ifindex persist
bridge-domain 200
!
interface GigabitEthernet1/0/2
description To_3850_SW1
mtu 9198
no ip address
media-type sfp auto-failover
negotiation auto
channel-group 5 mode active
!
interface GigabitEthernet1/0/3
description To_3850_SW2
mtu 9198
no ip address
media-type sfp auto-failover
negotiation auto
channel-group 5 mode active
!
interface GigabitEthernet1/0/4
description To_3850_SW3
mtu 9198
no ip address
media-type sfp auto-failover
negotiation auto
channel-group 5 mode active
!
interface GigabitEthernet1/0/5
description To_3850_SW4
mtu 9198
no ip address
media-type sfp auto-failover
negotiation auto
channel-group 5 mode active
interface BDI1
description Vlan 1 - L3
ip address x.x.x.x 255.255.255.0
no ip redirects
no ip proxy-arp
ip nat inside
ip pim sparse-mode
ip tcp adjust-mss 1360
vlan-id dot1q 1
!
encapsulation dot1Q 1
!
interface BDI100
description Vlan 100 - L3
no ip address
no ip redirects
no ip proxy-arp
ip nat inside
ip pim sparse-mode
ip tcp adjust-mss 1360
vlan-id dot1q 100
!
encapsulation dot1Q 100
!
interface BDI200
description Vlan 200 - L3
ip address x.x.x.x 255.255.255.0
ip nat inside
vlan-id dot1q 200
!
encapsulation dot1Q 200
!
ip route x.x.x.x 255.255.255.0 BDI1
ip route x.x.x.x 255.255.255.0 BDI200
Switch Config (connected through C3850-NM-4-10G)
interface Port-channel5
description connection_from_3850_switches_to_4451x_router
switchport trunk allowed vlan 1,100,200
switchport mode trunk
logging event trunk-status
logging event bundle-status
hold-queue 300 in
interface TenGigabitEthernet1/1/1
switchport trunk allowed vlan 1,100,200
switchport mode trunk
channel-group 5 mode active
interface TenGigabitEthernet2/1/1
switchport trunk allowed vlan 1,100,200
switchport mode trunk
channel-group 5 mode active
interface TenGigabitEthernet3/1/1
switchport trunk allowed vlan 1,100,200
switchport mode trunk
channel-group 5 mode active
interface TenGigabitEthernet4/1/1
switchport trunk allowed vlan 1,100,200
switchport mode trunk
channel-group 5 mode active
interface Vlan1
ip address x.x.x.x 255.255.255.0
!
interface Vlan100
no ip address
!
interface Vlan200
ip address x.x.x.x 255.255.255.0
Show Router Ether-Channel:
Port-channel5 is up, line protocol is up
Hardware is GEChannel, address is a023.9f74.7394 (bia a023.9f74.7394)
Description: Fiber_Bundle_to_Core_3850_Switches
MTU 9198 bytes, BW 4000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 04:00:00
No. of active members in this channel: 4
Member 0 : GigabitEthernet1/0/2 , Full-duplex, 1000Mb/s
Member 1 : GigabitEthernet1/0/3 , Full-duplex, 1000Mb/s
Member 2 : GigabitEthernet1/0/4 , Full-duplex, 1000Mb/s
Member 3 : GigabitEthernet1/0/5 , Full-duplex, 1000Mb/s
No. of PF_JUMBO supported members in this channel : 4
Show Switch Ether-Channel:
Port-channel5 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 70f3.5a10.e31d (bia 70f3.5a10.e31d)
Description: connection_from_3850_switches_to_4451x_router
MTU 9198 bytes, BW 4000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 24/255, rxload 12/255
Encapsulation ARPA, loopback not set
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
5 Po5(SU) LACP Te1/1/1(P) Te2/1/1(P) Te3/1/1(P)
Te4/1/1(P)
06-15-2018 01:58 PM - edited 06-15-2018 02:04 PM
I have also tried this as just etherchannel on, rather than LACP with the same results.
The 3850's are supposed to add support for PAgP and LACP.
As soon as you turn on the ports (or connect the ports) the BDI interfaces on the router come up.
BDI1 x.x.x.x YES NVRAM up up
BDI100 unassigned YES unset up up
BDI200 x.x.x.x YES NVRAM up up
Port-channel5 unassigned YES unset up up
03-19-2020 12:33 PM
VLAN 1 is going to be native on the 3850 switch side unless you specifically tell the switch to tag it. On the router side it looks like you are tagging that VLAN. Is that you issue? What IPs are you trying to ping from? Do you have layer 3 routing turned on the switch module?
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