graphviz cluster's label multiple lines

Question

I'm using python+graphviz in order to create networking topologies out of the information contained in Racktables. I've succeded pretty well so far but I'm willing now to add multiple lines labels to a cluster (not a node).

For example, I have the following code with python:

for router in routers:
   [...]
   cluster_name = "cluster"+str(i)
   router_label=router_name+"\n"+router_hw
   c = gv.Graph(cluster_name)
   c.body.append('label='+router_label)

When ever I run that program, I get the following:

ST120_CMS70_SARM
SARM
ST202_P9J70_SARM
SARM
Error: node "SARM" is contained in two non-comparable clusters "cluster1" and "cluster0"

But, if I change this router_label=router_name+"\n"+router_hw to this router_label=router_name+"_"+router_hw, I get no error and the topology gets drawn, but, of course, a one line label.

Any hint on this?

Many thanks!

Lucas

Answer 1

Ok, I've found the solution. The multiline label is achieved using HTML like labels, like the following one...

router_label="<"+router_name+"<BR />"+router_ip+">"
c = gv.Graph(cluster_name)
c.body.append('label='+router_label)

This code provides the following:

Thanks!

Lucas