CRS bundle-eth

coastail · ‎08-24-2010

I go to make a LACP layer3 bundle. One of these interfaces config like this:

interface GigabitEthernet0/3/0/2

mtu 3014

ipv4 address X.X.X.X 255.255.255.252

ipv4 verify unicast source reachable-via any

mpls ldp

interface GigabitEthernet0/3/0/2

router ospf 1

area 1

interface GigabitEthernet0/3/0/2

authentication message-digest

message-digest-key 1 md5 encrypted ********

------------------------Below is my draft---------------------------------------------------------

interface GigabitEthernet0/3/0/2

bundle id 1

bundle id 1 mode on

duplex full

speed 1000

interface bundle-eth 1

ipv4 address X.X.X.X 255.255.255.252

mtu 3014 <--- or under int g0/3/0/2 ?

<--- MTU is still 3014 ?

mpls ldp

interface bundle-eth 1 <-- or int g0/3/0/2 ?

router ospf 1

area 1

interface bundle-eth 1

authentication message-digest

message-digest-key 1 md5 encrypted ********

Q1. I don't know it's right or wrong ,and if there is anything I didn't mention ?

Q2. Does there any hardware limit ? (eg. bundle 0/1/0/0 ,0/2/0/0 port that on different PLIM or SPA)

Thanks

Giuseppe Larosa · ‎08-24-2010

Hello Coastail,

as you would like to configure a L3 LACP bundle also MPLS configuration applies to the bundle

>>Q1) I don't know it's right or wrong ,and if there is anything I didn't mention ?

you need to use mode active with mode on you are not using LACP

mtu has to be set on member links also

see

>> To enable active or passive LACP on the bundle, include the optional mode active or mode passive keywords in the command string.

http://www.cisco.com/en/US/docs/routers/crs/software/crs_r3.9/interfaces/configuration/guide/hc39lbun.html#wp1011822

>>Q2. Does there any hardware limit ? (eg. bundle 0/1/0/0 ,0/2/0/0 port that on different PLIM or SPA)

it is supported also on multishelf configuration

see same link

http://www.cisco.com/en/US/docs/routers/crs/software/crs_r3.9/interfaces/configuration/guide/hc39lbun.html#wp1011822

note:

I would not recommend to use an LACP bundle on a router like this, but I would use two parallel L3 /MPLS links

Hope to help

Giuseppe

Atif Awan · ‎08-24-2010

Link bundles have been extensively used on CRS-1and in production networks. Link bundling does make sense in many scenarios especially when you are not losing any critical feature that would otherwise work on ECMP links but does not work on link bundles.